diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
new file mode 100644
index 0000000..a0d4911
--- /dev/null
+++ b/.github/workflows/publish.yaml
@@ -0,0 +1,68 @@
+name: Publish release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  check-version:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.get-version.outputs.version }}
+      tag-exists: ${{ steps.check-tag.outputs.exists }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get version from package.json
+        id: get-version
+        run: echo "version=$(jq -r .version package.json)" >> "$GITHUB_OUTPUT"
+
+      - name: Check if tag already exists
+        id: check-tag
+        run: |
+          VERSION="${{ steps.get-version.outputs.version }}"
+          if git tag --list | grep -qx "$VERSION"; then
+            echo "exists=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "exists=false" >> "$GITHUB_OUTPUT"
+          fi
+
+  publish:
+    needs: check-version
+    if: needs.check-version.outputs.tag-exists == 'false'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Tag release
+        run: |
+          VERSION="${{ needs.check-version.outputs.version }}"
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git tag "$VERSION"
+          git push origin "$VERSION"
+
+      - name: Create GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ needs.check-version.outputs.version }}
+          name: ${{ needs.check-version.outputs.version }}
+          files: |
+            main.js
+            manifest.json
+            styles.css
diff --git a/.gitignore b/.gitignore
index e09a007..4fa59f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,22 +1,26 @@
-# vscode
-.vscode 
-
-# Intellij
-*.iml
-.idea
-
-# npm
-node_modules
-
-# Don't include the compiled main.js file in the repo.
-# They should be uploaded to GitHub releases instead.
-main.js
-
-# Exclude sourcemaps
-*.map
-
-# obsidian
-data.json
-
-# Exclude macOS Finder (System Explorer) View States
-.DS_Store
+# vscode
+.vscode 
+
+# Intellij
+*.iml
+.idea
+
+# npm
+node_modules
+
+# Don't include the compiled main.js file in the repo.
+# They should be uploaded to GitHub releases instead.
+main.js
+
+# Exclude sourcemaps
+*.map
+
+# obsidian
+data.json
+
+# Exclude macOS Finder (System Explorer) View States
+.DS_Store
+
+# Exclude obsidian developer docs
+obsidian-developer-docs
+apil10ndev*.json
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..24d28d3
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,22 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] — 2026-04-28
+
+### Added
+
+- Translate the active note via the command palette ("Translate current note"), ribbon icon, and right-click context menus (file explorer and editor)
+- Dynamic language picker using `SuggestModal` — searches [l10n.dev](https://l10n.dev) in real time with a 300 ms debounce; no hardcoded language list
+- Three output modes configurable in settings:
+  - **Create a new note** (default) — saves translation as `{filename} ({lang-code}).md` in the same folder
+  - **Replace current note content** — overwrites the note in place
+  - **Append to current note** — appends translation below a horizontal rule
+- YAML frontmatter toggle — when disabled, frontmatter is preserved verbatim and only the note body is sent for translation
+- Success notice shows characters used and remaining balance from the API response
+- Secure API key input (password-masked) in settings
+- Async balance display in settings tab — fetches current character balance when the tab is opened
+- Typed error handling: 401 Unauthorized and 402 Payment Required surface actionable notices with direct links to [l10n.dev/ws/keys](https://l10n.dev/ws/keys) and [l10n.dev/#pricing](https://l10n.dev/#pricing)
+- Mobile-compatible — all network calls use Obsidian's `requestUrl`; no Node.js or Electron APIs used
diff --git a/README.md b/README.md
index 8ffa20e..03491c0 100644
--- a/README.md
+++ b/README.md
@@ -1,90 +1,74 @@
-# Obsidian Sample Plugin
+# L10n.dev - AI Translator for Obsidian
 
-This is a sample plugin for Obsidian (https://obsidian.md).
+Translate your Obsidian notes using [l10n](https://l10n.dev).dev — an AI-powered localization API. Works on desktop and mobile.
 
-This project uses TypeScript to provide type checking and documentation.
-The repo depends on the latest plugin API (obsidian.d.ts) in TypeScript Definition format, which contains TSDoc comments describing what it does.
+## Features
 
-This sample plugin demonstrates some of the basic functionality the plugin API can do.
-- Adds a ribbon icon, which shows a Notice when clicked.
-- Adds a command "Open modal (simple)" which opens a Modal.
-- Adds a plugin setting tab to the settings page.
-- Registers a global click event and output 'click' to the console.
-- Registers a global interval which logs 'setInterval' to the console.
+- Context-aware translations using advanced AI. Translate to 165+ languages.
+- Preserves Markdown formatting and struvture.
+- Translate the active note via the command palette, ribbon icon, or right-click context menu.
+- Dynamic language search — type a language name to find it instantly (no hardcoded list)
+- Remembers your last used language — one keypress to repeat the same translation.
+- Three output modes: create a new note, replace the current note, or append the translation.
+- Optional YAML frontmatter preservation — translate only the note body if desired.
+- Shows characters used and remaining balance after each translation.
+- Mobile-compatible — uses Obsidian's native network layer, no Node.js APIs
 
-## First time developing plugins?
+## Requirements
 
-Quick starting guide for new plugin devs:
+A free [l10n.dev](https://l10n.dev) account. You receive **30,000 characters free per month** after signing up. Get your API key at [l10n.dev/ws/keys](https://l10n.dev/ws/keys).
 
-- Check if [someone already developed a plugin for what you want](https://obsidian.md/plugins)! There might be an existing plugin similar enough that you can partner up with.
-- Make a copy of this repo as a template with the "Use this template" button (login to GitHub if you don't see it).
-- Clone your repo to a local development folder. For convenience, you can place this folder in your `.obsidian/plugins/your-plugin-name` folder.
-- Install NodeJS, then run `npm i` in the command line under your repo folder.
-- Run `npm run dev` to compile your plugin from `main.ts` to `main.js`.
-- Make changes to `main.ts` (or create new `.ts` files). Those changes should be automatically compiled into `main.js`.
-- Reload Obsidian to load the new version of your plugin.
-- Enable plugin in settings window.
-- For updates to the Obsidian API run `npm update` in the command line under your repo folder.
+## Installation
 
-## Releasing new releases
+### Community plugin (recommended)
 
-- Update your `manifest.json` with your new version number, such as `1.0.1`, and the minimum Obsidian version required for your latest release.
-- Update your `versions.json` file with `"new-plugin-version": "minimum-obsidian-version"` so older versions of Obsidian can download an older version of your plugin that's compatible.
-- Create new GitHub release using your new version number as the "Tag version". Use the exact version number, don't include a prefix `v`. See here for an example: https://github.com/obsidianmd/obsidian-sample-plugin/releases
-- Upload the files `manifest.json`, `main.js`, `styles.css` as binary attachments. Note: The manifest.json file must be in two places, first the root path of your repository and also in the release.
-- Publish the release.
+1. Open **Settings → Community plugins** and select **Browse**.
+2. Search for **L10n.dev - AI Translator**.
+3. Select **Install**, then **Enable**.
 
-> You can simplify the version bump process by running `npm version patch`, `npm version minor` or `npm version major` after updating `minAppVersion` manually in `manifest.json`.
-> The command will bump version in `manifest.json` and `package.json`, and add the entry for the new version to `versions.json`
+### Manual installation
 
-## Adding your plugin to the community plugin list
+1. Go to the [latest release](../../releases/latest) and download `manifest.json`, `main.js`, and `styles.css`.
+2. In your vault, create the folder `<YourVault>/.obsidian/plugins/ai-translator/`.
+3. Copy the three downloaded files into that folder.
+4. Open Obsidian, go to **Settings → Community plugins**, and enable **L10n.dev - AI Translator**.
 
-- Check the [plugin guidelines](https://docs.obsidian.md/Plugins/Releasing/Plugin+guidelines).
-- Publish an initial version.
-- Make sure you have a `README.md` file in the root of your repo.
-- Make a pull request at https://github.com/obsidianmd/obsidian-releases to add your plugin.
+## Setup
 
-## How to use
+1. Open **Settings → L10n.dev - AI Translator**.
+2. Paste your l10n.dev API key into the **API key** field.
+3. Choose your preferred **Output behavior** and toggle **Translate frontmatter** as needed.
 
-- Clone this repo.
-- Make sure your NodeJS is at least v16 (`node --version`).
-- `npm i` or `yarn` to install dependencies.
-- `npm run dev` to start compilation in watch mode.
+## Usage
 
-## Manually installing the plugin
+With a note open, trigger translation in any of these ways:
 
-- Copy over `main.js`, `styles.css`, `manifest.json` to your vault `VaultFolder/.obsidian/plugins/your-plugin-id/`.
+- **Command palette** — run `Translate current note`
+- **Ribbon** — select the globe icon in the left sidebar
+- **Context menu** — right-click a file in the file explorer or inside the editor and select **Translate…**
 
-## Improve code quality with eslint
-- [ESLint](https://eslint.org/) is a tool that analyzes your code to quickly find problems. You can run ESLint against your plugin to find common bugs and ways to improve your code. 
-- This project already has eslint preconfigured, you can invoke a check by running`npm run lint`
-- Together with a custom eslint [plugin](https://github.com/obsidianmd/eslint-plugin) for Obsidan specific code guidelines.
-- A GitHub action is preconfigured to automatically lint every commit on all branches.
+A language picker will open. Type a language name (e.g. "Spanish", "German", "Japanese") and select your target language. The translation will be saved according to your output behavior setting.
 
-## Funding URL
+### Repeat translation to the same language
 
-You can include funding URLs where people who use your plugin can financially support it.
+After your first translation, the last used language is saved automatically. The next time the language picker opens, it pre-selects that language — press Enter to confirm without typing anything.
 
-The simple way is to set the `fundingUrl` field to your link in your `manifest.json` file:
+For even faster repeat translations, use the **Translate to last used language** command from the command palette. It skips the language picker entirely and translates immediately. Assign a hotkey to it in **Settings → Hotkeys** for one-keystroke translation.
 
-```json
-{
-    "fundingUrl": "https://buymeacoffee.com"
-}
-```
+## Output behavior
 
-If you have multiple URLs, you can also do:
+| Setting | Result |
+|---|---|
+| Create a new note (default) | Saves translation as `{filename} ({lang-code}).md` in the same folder |
+| Replace current note content | Overwrites the current note with the translation |
+| Append to current note | Appends the translation below a horizontal rule |
 
-```json
-{
-    "fundingUrl": {
-        "Buy Me a Coffee": "https://buymeacoffee.com",
-        "GitHub Sponsor": "https://github.com/sponsors",
-        "Patreon": "https://www.patreon.com/"
-    }
-}
-```
+## Privacy
 
-## API Documentation
+Translation requests are sent to the [AI translation API](https://api.l10n.dev/doc/#tag/ai-translation) over HTTPS. l10n.dev does not store your content after translation. See the [l10n.dev terms of service](https://l10n.dev/terms-of-service) for details.
 
-See https://docs.obsidian.md
+No telemetry or analytics are collected by this plugin.
+
+## License
+
+[MIT](LICENSE)
diff --git a/TESTING.md b/TESTING.md
new file mode 100644
index 0000000..2778ba8
--- /dev/null
+++ b/TESTING.md
@@ -0,0 +1,98 @@
+# Testing the L10n.dev - AI Translator plugin
+
+## Prerequisites
+
+- [Node.js](https://nodejs.org/) 18 or later
+- An Obsidian vault (desktop or mobile)
+- A [l10n.dev](https://l10n.dev) account and API key — get one free at [l10n.dev/ws/keys](https://l10n.dev/ws/keys)
+
+---
+
+## 1. Get the plugin files
+
+**For testing a release** — download `main.js`, `manifest.json`, and `styles.css` from the [latest release](../../releases/latest).
+
+**For local development** — build from source:
+
+```bash
+npm install
+npm run build
+```
+
+This produces `main.js` in the repository root.
+
+---
+
+## 2. Install into your vault (desktop)
+
+1. Locate your vault folder. Inside it, open (or create) the directory:
+   ```
+   <YourVault>/.obsidian/plugins/ai-translator/
+   ```
+2. Copy the following files from the repository root into that folder:
+   - `main.js`
+   - `manifest.json`
+   - `styles.css` (if present)
+3. Open Obsidian.
+4. Go to **Settings → Community plugins**.
+5. If prompted, select **Turn on community plugins**.
+6. Find **L10n.dev - AI Translator** in the list and toggle it on.
+
+> **Tip:** Clone the repository directly into `<YourVault>/.obsidian/plugins/ai-translator/` and run `npm run dev` for live reloading during development.
+
+---
+
+## 3. Configure the plugin
+
+1. Open **Settings → L10n.dev - AI Translator**.
+2. Paste your l10n.dev API key into the **API key** field — the remaining balance should appear below it automatically.
+3. Choose an **Output behavior** and set the **Translate frontmatter** toggle as desired.
+
+---
+
+## 4. Run a translation
+
+1. Open any Markdown note.
+2. Trigger translation using any of these entry points:
+   - **Command palette** — `Ctrl/Cmd + P` → `Translate current note`
+   - **Ribbon** — select the globe icon in the left sidebar
+   - **Context menu (editor)** — right-click inside the note body → **Translate…**
+   - **Context menu (file explorer)** — right-click a `.md` file → **Translate…**
+3. Type a language name in the picker (e.g. "Spanish") and select a result.
+4. The output is saved according to the output behavior setting.
+
+---
+
+## 5. Manual test checklist
+
+| Scenario | Expected result |
+|---|---|
+| Valid API key, output = **create new note** | `{filename} ({lang-code}).md` created in the same folder |
+| Valid API key, output = **replace** | Current note content replaced |
+| Valid API key, output = **append** | Translation appended below `---` |
+| **Translate frontmatter** OFF | YAML block at top of translated file is identical to original |
+| **Translate frontmatter** ON | YAML block is translated along with the body |
+| Wrong API key | Notice: "Invalid API key. Get your key at https://l10n.dev/ws/keys" |
+| Insufficient balance | Notice: "Insufficient balance. Top up at https://l10n.dev/#pricing" |
+| No note open, command triggered | Notice: "No active note to translate." |
+| Language picker closed without selecting | Translation cancelled silently |
+| Success | Notice shows characters used and remaining balance |
+
+---
+
+## 6. Mobile testing
+
+1. Build `main.js` on desktop (`npm run build`).
+2. Transfer `main.js`, `manifest.json`, and `styles.css` to your vault's `.obsidian/plugins/ai-translator/` folder using a sync solution (e.g. iCloud, Obsidian Sync, or manual file transfer).
+3. Open Obsidian on the mobile device and enable the plugin as described in step 2.
+4. Repeat the manual test checklist on mobile, paying attention to the language picker and context menu behaviour.
+
+---
+
+## 7. Linting
+
+```bash
+npm run lint
+```
+
+The project uses [eslint-plugin-obsidianmd](https://github.com/obsidianmd/eslint-plugin) for Obsidian-specific code guidelines alongside `typescript-eslint`.
diff --git a/manifest.json b/manifest.json
index dfa940e..d011f76 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,11 +1,10 @@
 {
-	"id": "sample-plugin",
-	"name": "Sample Plugin",
+	"id": "ai-translator",
+	"name": "L10n.dev - AI Translator",
 	"version": "1.0.0",
 	"minAppVersion": "0.15.0",
-	"description": "Demonstrates some of the capabilities of the Obsidian API.",
-	"author": "Obsidian",
-	"authorUrl": "https://obsidian.md",
-	"fundingUrl": "https://obsidian.md/pricing",
+	"description": "Translate notes into any of 165 languages with AI. Preserves Markdown formatting and structure. Powered by L10n.dev's AI translation API.",
+	"author": "l10n.dev",
+	"authorUrl": "https://l10n.dev",
 	"isDesktopOnly": false
 }
diff --git a/package-lock.json b/package-lock.json
index d0dac39..74db538 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,13 @@
 {
-	"name": "obsidian-sample-plugin",
+	"name": "obsidian-plugin-ai-translator",
 	"version": "1.0.0",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
-			"name": "obsidian-sample-plugin",
+			"name": "obsidian-plugin-ai-translator",
 			"version": "1.0.0",
-			"license": "0-BSD",
+			"license": "MIT",
 			"dependencies": {
 				"obsidian": "latest"
 			},
@@ -1044,9 +1044,9 @@
 			}
 		},
 		"node_modules/@typescript-eslint/typescript-estree/node_modules/brace-expansion": {
-			"version": "2.0.2",
-			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.2.tgz",
-			"integrity": "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==",
+			"version": "2.1.0",
+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.0.tgz",
+			"integrity": "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -1054,13 +1054,13 @@
 			}
 		},
 		"node_modules/@typescript-eslint/typescript-estree/node_modules/minimatch": {
-			"version": "9.0.5",
-			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
-			"integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
+			"version": "9.0.9",
+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.9.tgz",
+			"integrity": "sha512-OBwBN9AL4dqmETlpS2zasx+vTeWclWzkblfZk7KTA5j3jeOONz/tRCnZomUyvNg83wL5Zv9Ss6HMJXAgL8R2Yg==",
 			"dev": true,
 			"license": "ISC",
 			"dependencies": {
-				"brace-expansion": "^2.0.1"
+				"brace-expansion": "^2.0.2"
 			},
 			"engines": {
 				"node": ">=16 || 14 >=14.17"
@@ -1148,9 +1148,9 @@
 			}
 		},
 		"node_modules/ajv": {
-			"version": "6.12.6",
-			"resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
-			"integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+			"version": "6.15.0",
+			"resolved": "https://registry.npmjs.org/ajv/-/ajv-6.15.0.tgz",
+			"integrity": "sha512-fgFx7Hfoq60ytK2c7DhnF8jIvzYgOMxfugjLOSMHjLIPgenqa7S7oaagATUq99mV6IYvN2tRmC0wnTYX6iPbMw==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -1381,9 +1381,9 @@
 			"license": "MIT"
 		},
 		"node_modules/brace-expansion": {
-			"version": "1.1.12",
-			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
-			"integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
+			"version": "1.1.14",
+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.14.tgz",
+			"integrity": "sha512-MWPGfDxnyzKU7rNOW9SP/c50vi3xrmrua/+6hfPbCS2ABNWfx24vPidzvC7krjU/RTo235sV776ymlsMtGKj8g==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -2188,9 +2188,9 @@
 			}
 		},
 		"node_modules/eslint-plugin-json-schema-validator/node_modules/ajv": {
-			"version": "8.17.1",
-			"resolved": "https://registry.npmjs.org/ajv/-/ajv-8.17.1.tgz",
-			"integrity": "sha512-B/gBuNg5SiMTrPkC+A2+cW0RszwxYmn6VYxB/inlBStS5nx6xHIt/ehKRhIMhqusl7a8LjQoZnjCs5vhwxOQ1g==",
+			"version": "8.20.0",
+			"resolved": "https://registry.npmjs.org/ajv/-/ajv-8.20.0.tgz",
+			"integrity": "sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -2205,9 +2205,9 @@
 			}
 		},
 		"node_modules/eslint-plugin-json-schema-validator/node_modules/brace-expansion": {
-			"version": "2.0.2",
-			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.2.tgz",
-			"integrity": "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==",
+			"version": "2.1.0",
+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.0.tgz",
+			"integrity": "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -2222,9 +2222,9 @@
 			"license": "MIT"
 		},
 		"node_modules/eslint-plugin-json-schema-validator/node_modules/minimatch": {
-			"version": "8.0.4",
-			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-8.0.4.tgz",
-			"integrity": "sha512-W0Wvr9HyFXZRGIDgCicunpQ299OKXs9RgZfaukz4qAW/pJhcpUfupc9c+OObPOFueNy8VSrZgEmDtk6Kh4WzDA==",
+			"version": "8.0.7",
+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-8.0.7.tgz",
+			"integrity": "sha512-V+1uQNdzybxa14e/p00HZnQNNcTjnRJjDxg2V8wtkjFctq4M7hXFws4oekyTP0Jebeq7QYtpFyOeBAjc88zvYg==",
 			"dev": true,
 			"license": "ISC",
 			"dependencies": {
@@ -2264,9 +2264,9 @@
 			}
 		},
 		"node_modules/eslint-plugin-n/node_modules/brace-expansion": {
-			"version": "2.0.2",
-			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.2.tgz",
-			"integrity": "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==",
+			"version": "2.1.0",
+			"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.0.tgz",
+			"integrity": "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -2287,13 +2287,13 @@
 			}
 		},
 		"node_modules/eslint-plugin-n/node_modules/minimatch": {
-			"version": "9.0.5",
-			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
-			"integrity": "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow==",
+			"version": "9.0.9",
+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.9.tgz",
+			"integrity": "sha512-OBwBN9AL4dqmETlpS2zasx+vTeWclWzkblfZk7KTA5j3jeOONz/tRCnZomUyvNg83wL5Zv9Ss6HMJXAgL8R2Yg==",
 			"dev": true,
 			"license": "ISC",
 			"dependencies": {
-				"brace-expansion": "^2.0.1"
+				"brace-expansion": "^2.0.2"
 			},
 			"engines": {
 				"node": ">=16 || 14 >=14.17"
@@ -2691,9 +2691,9 @@
 			}
 		},
 		"node_modules/flatted": {
-			"version": "3.3.3",
-			"resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.3.tgz",
-			"integrity": "sha512-GX+ysw4PBCz0PzosHDepZGANEuFCMLrnRTiEy9McGjmkCQYwRq4A/X786G/fjM/+OjsWSU1ZrY5qyARZmO/uwg==",
+			"version": "3.4.2",
+			"resolved": "https://registry.npmjs.org/flatted/-/flatted-3.4.2.tgz",
+			"integrity": "sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==",
 			"dev": true,
 			"license": "ISC"
 		},
@@ -3522,9 +3522,9 @@
 			}
 		},
 		"node_modules/json-schema-migrate/node_modules/ajv": {
-			"version": "8.17.1",
-			"resolved": "https://registry.npmjs.org/ajv/-/ajv-8.17.1.tgz",
-			"integrity": "sha512-B/gBuNg5SiMTrPkC+A2+cW0RszwxYmn6VYxB/inlBStS5nx6xHIt/ehKRhIMhqusl7a8LjQoZnjCs5vhwxOQ1g==",
+			"version": "8.20.0",
+			"resolved": "https://registry.npmjs.org/ajv/-/ajv-8.20.0.tgz",
+			"integrity": "sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==",
 			"dev": true,
 			"license": "MIT",
 			"dependencies": {
@@ -3746,9 +3746,9 @@
 			}
 		},
 		"node_modules/minimatch": {
-			"version": "3.1.2",
-			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
-			"integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+			"version": "3.1.5",
+			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.5.tgz",
+			"integrity": "sha512-VgjWUsnnT6n+NUk6eZq77zeFdpW2LWDzP6zFGrCbHXiYNul5Dzqk2HHQ5uFH2DNW5Xbp8+jVzaeNt94ssEEl4w==",
 			"dev": true,
 			"license": "ISC",
 			"dependencies": {
@@ -4044,9 +4044,9 @@
 			"license": "MIT"
 		},
 		"node_modules/picomatch": {
-			"version": "2.3.1",
-			"resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
-			"integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
+			"version": "2.3.2",
+			"resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.2.tgz",
+			"integrity": "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==",
 			"dev": true,
 			"license": "MIT",
 			"engines": {
@@ -5101,9 +5101,9 @@
 			}
 		},
 		"node_modules/yaml": {
-			"version": "2.8.1",
-			"resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.1.tgz",
-			"integrity": "sha512-lcYcMxX2PO9XMGvAJkJ3OsNMw+/7FKes7/hgerGUYWIoWu5j/+YQqcZr5JnPZWzOsEBgMbSbiSTn/dv/69Mkpw==",
+			"version": "2.8.3",
+			"resolved": "https://registry.npmjs.org/yaml/-/yaml-2.8.3.tgz",
+			"integrity": "sha512-AvbaCLOO2Otw/lW5bmh9d/WEdcDFdQp2Z2ZUH3pX9U2ihyUY0nvLv7J6TrWowklRGPYbB/IuIMfYgxaCPg5Bpg==",
 			"dev": true,
 			"license": "ISC",
 			"bin": {
@@ -5111,6 +5111,9 @@
 			},
 			"engines": {
 				"node": ">= 14.6"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/eemeli"
 			}
 		},
 		"node_modules/yaml-eslint-parser": {
diff --git a/package.json b/package.json
index 17268d7..ccd7614 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
-	"name": "obsidian-sample-plugin",
+	"name": "obsidian-plugin-ai-translator",
 	"version": "1.0.0",
-	"description": "This is a sample plugin for Obsidian (https://obsidian.md)",
+	"description": "Obsidian plugin to translate notes with AI using l10n.dev",
 	"main": "main.js",
 	"type": "module",
 	"scripts": {
@@ -11,7 +11,7 @@
 		"lint": "eslint ."
 	},
 	"keywords": [],
-	"license": "0-BSD",
+	"license": "MIT",
 	"devDependencies": {
 		"@types/node": "^16.11.6",
 		"esbuild": "0.25.5",
diff --git a/src/LanguageSuggestModal.ts b/src/LanguageSuggestModal.ts
new file mode 100644
index 0000000..4358909
--- /dev/null
+++ b/src/LanguageSuggestModal.ts
@@ -0,0 +1,55 @@
+import { App, SuggestModal } from "obsidian";
+import { Language } from "./types";
+import { TranslationService } from "./TranslationService";
+
+export class LanguageSuggestModal extends SuggestModal<Language> {
+	private onSelect: (lang: Language) => void;
+	private lastLanguage: Language | undefined;
+	private debounceTimer: number | null = null;
+
+	constructor(
+		app: App,
+		lastLanguage: Language | undefined,
+		onSelect: (lang: Language) => void,
+	) {
+		super(app);
+		this.lastLanguage = lastLanguage;
+		this.onSelect = onSelect;
+		this.setPlaceholder(
+			lastLanguage
+				? `Last used: ${lastLanguage.name} — type to change…`
+				: "Type a language name (e.g. Spanish, German)…",
+		);
+	}
+
+	async getSuggestions(query: string): Promise<Language[]> {
+		if (!query.trim()) {
+			return this.lastLanguage ? [this.lastLanguage] : [];
+		}
+		return new Promise((resolve) => {
+			if (this.debounceTimer !== null) {
+				window.clearTimeout(this.debounceTimer);
+			}
+			this.debounceTimer = window.setTimeout(() => {
+				this.debounceTimer = null;
+				TranslationService.predictLanguages(query)
+					.then(resolve)
+					.catch(() => resolve([]));
+			}, 300);
+		});
+	}
+
+	renderSuggestion(lang: Language, el: HTMLElement): void {
+		el.createEl("span", { text: `${lang.name} — ${lang.code}` });
+		if (this.lastLanguage?.code === lang.code) {
+			el.createEl("span", {
+				text: "Last used",
+				cls: "ai-translator-last-used-badge",
+			});
+		}
+	}
+
+	onChooseSuggestion(lang: Language): void {
+		this.onSelect(lang);
+	}
+}
diff --git a/src/TranslationService.ts b/src/TranslationService.ts
new file mode 100644
index 0000000..07a5df6
--- /dev/null
+++ b/src/TranslationService.ts
@@ -0,0 +1,55 @@
+import { requestUrl } from "obsidian";
+import {
+	BalanceResponse,
+	Language,
+	TranslateRequest,
+	TranslateResponse,
+} from "./types";
+
+const API_BASE = "https://api.l10n.dev";
+
+export class TranslationService {
+	static async getBalance(apiKey: string): Promise<BalanceResponse> {
+		const response = await requestUrl({
+			url: `${API_BASE}/v2/balance`,
+			method: "GET",
+			headers: { "X-API-Key": apiKey },
+			throw: false,
+		});
+		if (response.status === 401) throw new Error("unauthorized");
+		if (response.status !== 200) throw new Error("network_error");
+		return response.json as BalanceResponse;
+	}
+
+	static async predictLanguages(input: string): Promise<Language[]> {
+		const response = await requestUrl({
+			url: `${API_BASE}/v2/languages/predict?input=${encodeURIComponent(input)}&limit=10`,
+			method: "GET",
+			throw: false,
+		});
+		if (response.status !== 200) return [];
+		const body = response.json as { languages?: Language[] };
+		return body.languages ?? [];
+	}
+
+	static async translate(
+		apiKey: string,
+		req: TranslateRequest,
+	): Promise<TranslateResponse> {
+		console.debug("[AI Translator] Sending translation request:", req);
+		const response = await requestUrl({
+			url: `${API_BASE}/v2/translate`,
+			method: "POST",
+			headers: {
+				"X-API-Key": apiKey,
+				"Content-Type": "application/json",
+			},
+			body: JSON.stringify(req),
+			throw: false,
+		});
+		if (response.status === 401) throw new Error("unauthorized");
+		if (response.status === 402) throw new Error("quota_exceeded");
+		if (response.status !== 200) throw new Error("network_error");
+		return response.json as TranslateResponse;
+	}
+}
diff --git a/src/main.ts b/src/main.ts
index 6fe0c83..89ade9a 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,99 +1,119 @@
-import {App, Editor, MarkdownView, Modal, Notice, Plugin} from 'obsidian';
-import {DEFAULT_SETTINGS, MyPluginSettings, SampleSettingTab} from "./settings";
+import { Menu, Plugin, TAbstractFile, TFile } from "obsidian";
+import { L10nSettings } from "./types";
+import { DEFAULT_SETTINGS, L10nSettingsTab } from "./settings";
+import { translateActiveNote, translateToLastLanguage } from "./translator";
 
-// Remember to rename these classes and interfaces!
-
-export default class MyPlugin extends Plugin {
-	settings: MyPluginSettings;
+export default class L10nPlugin extends Plugin {
+	settings: L10nSettings = { ...DEFAULT_SETTINGS };
 
 	async onload() {
 		await this.loadSettings();
 
-		// This creates an icon in the left ribbon.
-		this.addRibbonIcon('dice', 'Sample', (evt: MouseEvent) => {
-			// Called when the user clicks the icon.
-			new Notice('This is a notice!');
+		this.addRibbonIcon("languages", "Translate note", () => {
+			console.debug("[AI Translator] Translating active note");
+			translateActiveNote(this);
 		});
 
-		// This adds a status bar item to the bottom of the app. Does not work on mobile apps.
-		const statusBarItemEl = this.addStatusBarItem();
-		statusBarItemEl.setText('Status bar text');
-
-		// This adds a simple command that can be triggered anywhere
 		this.addCommand({
-			id: 'open-modal-simple',
-			name: 'Open modal (simple)',
+			id: "translate-current-note",
+			name: "Translate current note",
 			callback: () => {
-				new SampleModal(this.app).open();
-			}
+				translateActiveNote(this);
+			},
 		});
-		// This adds an editor command that can perform some operation on the current editor instance
+
 		this.addCommand({
-			id: 'replace-selected',
-			name: 'Replace selected content',
-			editorCallback: (editor: Editor, view: MarkdownView) => {
-				editor.replaceSelection('Sample editor command');
-			}
-		});
-		// This adds a complex command that can check whether the current state of the app allows execution of the command
-		this.addCommand({
-			id: 'open-modal-complex',
-			name: 'Open modal (complex)',
-			checkCallback: (checking: boolean) => {
-				// Conditions to check
-				const markdownView = this.app.workspace.getActiveViewOfType(MarkdownView);
-				if (markdownView) {
-					// If checking is true, we're simply "checking" if the command can be run.
-					// If checking is false, then we want to actually perform the operation.
-					if (!checking) {
-						new SampleModal(this.app).open();
-					}
-
-					// This command will only show up in Command Palette when the check function returns true
-					return true;
-				}
-				return false;
-			}
+			id: "translate-to-last-language",
+			name: "Translate to last used language",
+			callback: () => {
+				translateToLastLanguage(this);
+			},
 		});
 
-		// This adds a settings tab so the user can configure various aspects of the plugin
-		this.addSettingTab(new SampleSettingTab(this.app, this));
+		this.registerEvent(
+			this.app.workspace.on(
+				"file-menu",
+				(menu: Menu, abstractFile: TAbstractFile) => {
+					if (!(abstractFile instanceof TFile)) return;
+					menu.addItem((item) => {
+						item.setTitle("Translate…")
+							.setIcon("languages")
+							.onClick(() => {
+								console.debug(
+									"[AI Translator] Translating file:",
+									abstractFile.path,
+								);
+								translateActiveNote(this, abstractFile);
+							});
+					});
+				},
+			),
+		);
 
-		// If the plugin hooks up any global DOM events (on parts of the app that doesn't belong to this plugin)
-		// Using this function will automatically remove the event listener when this plugin is disabled.
-		this.registerDomEvent(document, 'click', (evt: MouseEvent) => {
-			new Notice("Click");
-		});
+		this.registerEvent(
+			this.app.workspace.on(
+				"file-menu",
+				(menu: Menu, abstractFile: TAbstractFile) => {
+					if (!(abstractFile instanceof TFile)) return;
+					menu.addItem((item) => {
+						item.setTitle("Translate to last used language")
+							.setIcon("languages")
+							.onClick(() => {
+								console.debug(
+									"[AI Translator] Translating file to last used language:",
+									abstractFile.path,
+								);
+								translateToLastLanguage(this, abstractFile);
+							});
+					});
+				},
+			),
+		);
 
-		// When registering intervals, this function will automatically clear the interval when the plugin is disabled.
-		this.registerInterval(window.setInterval(() => console.log('setInterval'), 5 * 60 * 1000));
+		this.registerEvent(
+			this.app.workspace.on("editor-menu", (menu: Menu) => {
+				menu.addItem((item) => {
+					item.setTitle("Translate to last used language")
+						.setIcon("languages")
+						.onClick(() => {
+							console.debug(
+								"[AI Translator] Translating current note to last used language",
+							);
+							translateToLastLanguage(this);
+						});
+				});
+			}),
+		);
 
+		this.registerEvent(
+			this.app.workspace.on("editor-menu", (menu: Menu) => {
+				menu.addItem((item) => {
+					item.setTitle("Translate…")
+						.setIcon("languages")
+						.onClick(() => {
+							console.debug(
+								"[AI Translator] Translating current note",
+							);
+							translateActiveNote(this);
+						});
+				});
+			}),
+		);
+
+		this.addSettingTab(new L10nSettingsTab(this.app, this));
 	}
 
-	onunload() {
-	}
+	onunload() {}
 
 	async loadSettings() {
-		this.settings = Object.assign({}, DEFAULT_SETTINGS, await this.loadData() as Partial<MyPluginSettings>);
+		this.settings = Object.assign(
+			{},
+			DEFAULT_SETTINGS,
+			(await this.loadData()) as Partial<L10nSettings>,
+		);
 	}
 
 	async saveSettings() {
 		await this.saveData(this.settings);
 	}
 }
-
-class SampleModal extends Modal {
-	constructor(app: App) {
-		super(app);
-	}
-
-	onOpen() {
-		let {contentEl} = this;
-		contentEl.setText('Woah!');
-	}
-
-	onClose() {
-		const {contentEl} = this;
-		contentEl.empty();
-	}
-}
diff --git a/src/settings.ts b/src/settings.ts
index 352121e..f67b7b9 100644
--- a/src/settings.ts
+++ b/src/settings.ts
@@ -1,36 +1,115 @@
-import {App, PluginSettingTab, Setting} from "obsidian";
-import MyPlugin from "./main";
+import { App, Plugin, PluginSettingTab, Setting } from "obsidian";
+import { L10nSettings, OutputBehavior, PluginWithSettings } from "./types";
+import { TranslationService } from "./TranslationService";
 
-export interface MyPluginSettings {
-	mySetting: string;
-}
+export type { L10nSettings };
 
-export const DEFAULT_SETTINGS: MyPluginSettings = {
-	mySetting: 'default'
-}
+export const DEFAULT_SETTINGS: L10nSettings = {
+	apiKey: "",
+	outputBehavior: "new-note",
+	translateFrontmatter: false,
+};
 
-export class SampleSettingTab extends PluginSettingTab {
-	plugin: MyPlugin;
+export class L10nSettingsTab extends PluginSettingTab {
+	plugin: PluginWithSettings;
 
-	constructor(app: App, plugin: MyPlugin) {
+	constructor(app: App, plugin: Plugin & PluginWithSettings) {
 		super(app, plugin);
 		this.plugin = plugin;
 	}
 
 	display(): void {
-		const {containerEl} = this;
-
+		const { containerEl } = this;
 		containerEl.empty();
 
+		new Setting(containerEl).setName("AI translator").setHeading();
+
+		// Balance refresh helper (defined before API key so onChange can call it)
+		const refreshBalance = (apiKey: string) => {
+			if (!apiKey) {
+				quotaEl.setText(
+					` ${(30000).toLocaleString()} characters free monthly.`,
+				);
+				return;
+			}
+			quotaEl.setText(" Loading…");
+			TranslationService.getBalance(apiKey)
+				.then((res) => {
+					quotaEl.setText(
+						` ${res.currentBalance.toLocaleString()} characters`,
+					);
+				})
+				.catch(() => {
+					quotaEl.setText(
+						` ${(30000).toLocaleString()} characters free monthly.`,
+					);
+				});
+		};
+
+		// API Key
+		const apiKeySetting = new Setting(containerEl)
+			.setName("API key")
+			.addText((text) => {
+				text.inputEl.type = "password";
+				text.setPlaceholder("Paste your API key here")
+					.setValue(this.plugin.settings.apiKey)
+					.onChange(async (value) => {
+						this.plugin.settings.apiKey = value.trim();
+						await this.plugin.saveSettings();
+						refreshBalance(this.plugin.settings.apiKey);
+					});
+			});
+		apiKeySetting.descEl.appendText("Your l10n.dev API key. Get one at ");
+		apiKeySetting.descEl.createEl("a", {
+			text: "l10n.dev/ws/keys",
+			href: "https://l10n.dev/ws/keys",
+			attr: { target: "_blank", rel: "noopener noreferrer" },
+		});
+
+		// Quota display
+		const quotaSetting = new Setting(containerEl)
+			.setName("Remaining balance")
+			.setDesc("Characters remaining for translation.")
+			.addButton((btn) => {
+				btn.setButtonText("Buy characters").onClick(() => {
+					window.open("https://l10n.dev/#pricing", "_blank");
+				});
+			});
+		const quotaEl = quotaSetting.descEl.createEl("span", { text: "" });
+
+		// Initial balance fetch
+		refreshBalance(this.plugin.settings.apiKey);
+
+		// Output behavior
 		new Setting(containerEl)
-			.setName('Settings #1')
-			.setDesc('It\'s a secret')
-			.addText(text => text
-				.setPlaceholder('Enter your secret')
-				.setValue(this.plugin.settings.mySetting)
-				.onChange(async (value) => {
-					this.plugin.settings.mySetting = value;
-					await this.plugin.saveSettings();
-				}));
+			.setName("Output behavior")
+			.setDesc("How translated content is saved.")
+			.addDropdown((dropdown) => {
+				dropdown
+					.addOption("new-note", "Create a new note")
+					.addOption("replace", "Replace current note content")
+					.addOption("append", "Append to current note")
+					.setValue(this.plugin.settings.outputBehavior)
+					.onChange(async (value) => {
+						this.plugin.settings.outputBehavior =
+							value as OutputBehavior;
+						await this.plugin.saveSettings();
+					});
+			});
+
+		// Translate frontmatter
+		new Setting(containerEl)
+			.setName("Translate frontmatter")
+			.setDesc(
+				"When enabled, YAML frontmatter will be included in the translation.",
+			)
+			.addToggle((toggle) => {
+				toggle
+					.setValue(this.plugin.settings.translateFrontmatter)
+					.onChange(async (value) => {
+						this.plugin.settings.translateFrontmatter = value;
+						await this.plugin.saveSettings();
+					});
+			});
 	}
 }
diff --git a/src/translator.ts b/src/translator.ts
new file mode 100644
index 0000000..955132e
--- /dev/null
+++ b/src/translator.ts
@@ -0,0 +1,161 @@
+import { Notice, TFile } from "obsidian";
+import { LanguageSuggestModal } from "./LanguageSuggestModal";
+import { TranslationService } from "./TranslationService";
+import { Language, PluginWithSettings } from "./types";
+
+const FRONTMATTER_REGEX = /^(---\r?\n[\s\S]*?\r?\n---\r?\n?)([\s\S]*)$/;
+
+function splitFrontmatter(
+	content: string,
+): { frontmatter: string; body: string } | null {
+	const match = FRONTMATTER_REGEX.exec(content);
+	if (!match) return null;
+	return { frontmatter: match[1] ?? "", body: match[2] ?? "" };
+}
+
+async function doTranslate(
+	plugin: PluginWithSettings,
+	file: TFile,
+	lang: Language,
+): Promise<void> {
+	let content: string;
+	try {
+		content = await plugin.app.vault.read(file);
+	} catch {
+		new Notice("Failed to read the note.");
+		return;
+	}
+
+	let sourceText = content;
+	let frontmatter = "";
+	if (!plugin.settings.translateFrontmatter) {
+		const parsed = splitFrontmatter(content);
+		if (parsed) {
+			frontmatter = parsed.frontmatter;
+			sourceText = parsed.body;
+		}
+	}
+
+	let translated: string;
+	let charsUsed = 0;
+	let remainingBalance: number | null | undefined;
+	const progressNotice = new Notice("Translating…", 0);
+	try {
+		const result = await TranslationService.translate(
+			plugin.settings.apiKey,
+			{
+				sourceStrings: sourceText,
+				targetLanguageCode: lang.code,
+				format: "txt",
+				useContractions: true,
+			},
+		);
+		translated = result.translations;
+		charsUsed = result.usage.charsUsed;
+		remainingBalance = result.remainingBalance;
+	} catch (err) {
+		progressNotice.hide();
+		const msg = err instanceof Error ? err.message : "";
+		if (msg === "unauthorized") {
+			new Notice(
+				"Invalid API key. Get your key at https://l10n.dev/ws/keys",
+			);
+		} else if (msg === "quota_exceeded") {
+			new Notice(
+				"Insufficient balance. Top up at https://l10n.dev/#pricing",
+			);
+		} else {
+			console.error("[AI Translator]", err);
+			new Notice(
+				"Translation failed. Check the developer console for details.",
+			);
+		}
+		return;
+	}
+	progressNotice.hide();
+
+	const outputContent = frontmatter + translated;
+	const { outputBehavior } = plugin.settings;
+
+	try {
+		if (outputBehavior === "replace") {
+			await plugin.app.vault.modify(file, outputContent);
+		} else if (outputBehavior === "append") {
+			await plugin.app.vault.modify(
+				file,
+				content + "\n\n---\n\n" + translated,
+			);
+		} else {
+			// new-note (default)
+			const folder = file.parent ? file.parent.path : "";
+			const newPath =
+				(folder && folder !== "/" ? folder + "/" : "") +
+				`${file.basename} (${lang.code}).md`;
+			const existing = plugin.app.vault.getAbstractFileByPath(newPath);
+			if (existing instanceof TFile) {
+				await plugin.app.vault.modify(existing, outputContent);
+			} else {
+				await plugin.app.vault.create(newPath, outputContent);
+			}
+		}
+		const balanceText =
+			remainingBalance != null
+				? ` ${remainingBalance.toLocaleString()} characters remaining.`
+				: "";
+		new Notice(
+			`Translation complete. Used ${charsUsed.toLocaleString()} characters.${balanceText}`,
+		);
+	} catch (err) {
+		console.error("[AI Translator]", err);
+		new Notice("Failed to save the translated note.");
+	}
+}
+
+export function translateActiveNote(
+	plugin: PluginWithSettings,
+	targetFile?: TFile,
+): void {
+	if (!plugin.settings.apiKey) {
+		new Notice("Please set your l10n.dev API key in settings.");
+		return;
+	}
+
+	const file = targetFile ?? plugin.app.workspace.getActiveFile();
+	if (!file) {
+		new Notice("No active note to translate.");
+		return;
+	}
+
+	new LanguageSuggestModal(
+		plugin.app,
+		plugin.settings.lastLanguage,
+		(lang) => {
+			plugin.settings.lastLanguage = lang;
+			void plugin.saveSettings();
+			void doTranslate(plugin, file, lang);
+		},
+	).open();
+}
+
+export function translateToLastLanguage(
+	plugin: PluginWithSettings,
+	targetFile?: TFile,
+): void {
+	const lang = plugin.settings.lastLanguage;
+	if (!lang) {
+		return translateActiveNote(plugin, targetFile);
+	}
+
+	if (!plugin.settings.apiKey) {
+		new Notice("Please set your l10n.dev API key in settings.");
+		return;
+	}
+
+	const file = targetFile ?? plugin.app.workspace.getActiveFile();
+	if (!file) {
+		new Notice("No active note to translate.");
+		return;
+	}
+
+	void doTranslate(plugin, file, lang);
+}
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..854c10f
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,39 @@
+export interface Language {
+	code: string;
+	name: string;
+}
+
+export type OutputBehavior = "new-note" | "replace" | "append";
+
+export interface L10nSettings {
+	apiKey: string;
+	outputBehavior: OutputBehavior;
+	translateFrontmatter: boolean;
+	lastLanguage?: Language;
+}
+
+export interface TranslateRequest {
+	sourceStrings: string;
+	targetLanguageCode: string;
+	format?: string;
+	useContractions?: boolean;
+}
+
+export interface TranslateResponse {
+	translations: string;
+	finishReason: string;
+	usage: { charsUsed: number };
+	remainingBalance?: number | null;
+}
+
+export interface BalanceResponse {
+	currentBalance: number;
+}
+
+import type { App } from "obsidian";
+
+export interface PluginWithSettings {
+	app: App;
+	settings: L10nSettings;
+	saveSettings(): Promise<void>;
+}
diff --git a/styles.css b/styles.css
index 71cc60f..8202cbd 100644
--- a/styles.css
+++ b/styles.css
@@ -6,3 +6,13 @@ available in the app when your plugin is enabled.
 If your plugin does not need CSS, delete this file.
 
 */
+
+.ai-translator-last-used-badge {
+	margin-left: 6px;
+	padding: 1px 6px;
+	border-radius: 3px;
+	font-size: 0.75em;
+	background-color: var(--interactive-accent);
+	color: var(--text-on-accent);
+	vertical-align: middle;
+}
diff --git a/tsconfig.json b/tsconfig.json
index 222535d..a4e09c8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,5 @@
-{
+{
 	"compilerOptions": {
-		"baseUrl": "src",
 		"inlineSourceMap": true,
 		"inlineSources": true,
 		"module": "ESNext",
@@ -9,7 +8,7 @@
 		"noImplicitAny": true,
 		"noImplicitThis": true,
 		"noImplicitReturns": true,
-		"moduleResolution": "node",
+		"moduleResolution": "bundler",
 		"importHelpers": true,
 		"noUncheckedIndexedAccess": true,
 		"isolatedModules": true,
@@ -17,14 +16,7 @@
 		"strictBindCallApply": true,
 		"allowSyntheticDefaultImports": true,
 		"useUnknownInCatchVariables": true,
-		"lib": [
-			"DOM",
-			"ES5",
-			"ES6",
-			"ES7"
-		]
+		"lib": ["DOM", "ES5", "ES6", "ES7"]
 	},
-	"include": [
-		"src/**/*.ts"
-	]
+	"include": ["src/**/*.ts"]
 }