LingvAI

LingvAI is an enhanced fork of Lingva Translate — a privacy-respecting alternative front-end for Google Translate — extended with Replicate AI-powered translation, an admin panel, and document translation (PDF, Word, Excel, CSV) with full formatting preservation.

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Features

Core (from Lingva Translate)

• 100+ languages via Google Translate scraper (no tracking)
• Audio playback for source and translated text
• Auto-translate mode
• GraphQL and REST API
• PWA support (installable)
• Dark/light mode

New in LingvAI

Admin Panel (/admin)

• Password-protected settings dashboard (gear icon in header)
• Configure Replicate API token and JigsawStack API key
• Select/change the Replicate model version
• Enable/disable AI translation per-instance
• Test translation button
• Change admin password
• Settings stored server-side in data/settings.json (never committed)

Replicate AI Translation

• When enabled in admin, uses Replicate + JigsawStack text-translate model
• Replaces Google Translate scraper with AI translation when active
• Falls back to original lingva-scraper when Replicate is disabled
• Batch translation with separator trick for efficiency

Document Translation (new "Document" tab)

Translate whole documents while preserving original formatting:

Format	Formatting	Notes
.xlsx / .xls	Fully preserved	Cell styles, formulas, column widths intact. Select which columns to translate.
.docx	Fully preserved	Fonts, tables, images, paragraph styles preserved via XML manipulation
.csv	Structure preserved	Column selection supported
.pdf	Best-effort	Text extracted, translated, new formatted PDF generated

• Drag-and-drop or click-to-upload (up to 50 MB)
• Column selector for Excel/CSV: choose individual columns, use All/None toggles per sheet
• Download translated file (named original_<lang>.ext)

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Getting Started

Prerequisites

• Node.js 16+
• npm

Installation

git clone https://devops.cloudhost.es/CloudHost/LingvAI.git
cd LingvAI
npm install

Environment Variables

Create a .env.local file:

# Admin panel
ADMIN_PASSWORD=your_secure_password       # Default: admin
ADMIN_JWT_SECRET=random_secret_string     # Used to sign admin session tokens

# Replicate AI (optional - can also be set via admin panel)
REPLICATE_API_TOKEN=r8_...
JIGSAWSTACK_API_KEY=sk_...

# Optional: override default languages
NEXT_PUBLIC_DEFAULT_SOURCE_LANG=auto
NEXT_PUBLIC_DEFAULT_TARGET_LANG=en

Running

# Development
npm run dev

# Production
npm run build
npm start

The app runs on http://localhost:3000 by default.

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Configuration

Setting up Replicate AI Translation

1. Open the app and click the gear icon (⚙) in the top-right header
2. Log in with your admin password (default: admin)
3. Enter your Replicate API token — get one at replicate.com/account/api-tokens
4. Enter your JigsawStack API key — get one at jigsawstack.com
5. Optionally change the model version (default is the JigsawStack text-translate model)
6. Toggle Enable Replicate Translation on
7. Click Save Settings
8. Use Test Translation to verify it works

Default model:

jigsawstack/text-translate:454df4c49941c05dea05175bd37686d0872c73c1f9366d1c2505db32ade52a89

Replicate API call format

curl -X POST \
  -H "Authorization: Bearer $REPLICATE_API_TOKEN" \
  -H "Content-Type: application/json" \
  -H "Prefer: wait" \
  -d '{
    "version": "jigsawstack/text-translate:454df4c49941c05dea05175bd37686d0872c73c1f9366d1c2505db32ade52a89",
    "input": {
      "text": "Hello, world!",
      "api_key": "<jigsawstack_api_key>",
      "target_language": "es"
    }
  }' \
  https://api.replicate.com/v1/predictions

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API Endpoints

Original REST API

GET /api/v1/:source/:target/:query   → { translation, info }
GET /api/v1/audio/:lang/:text        → { audio: number[] }
GET /api/v1/languages                → { languages }

GraphQL

POST /api/graphql

New Endpoints

POST /api/translate/replicate
  Body: { text: string, targetLanguage: string }
  Returns: { translation: string }

POST /api/translate/document
  Body: multipart/form-data
    file: <file>
    targetLanguage: string
    action: "translate" | "getColumns"
    columnSelections?: JSON string (for Excel/CSV)
  Returns: file download (translate) or { columns } (getColumns)

GET  /api/admin/auth      → { authenticated: boolean }
POST /api/admin/auth      body: { password } → sets session cookie
DELETE /api/admin/auth    → clears session cookie

GET  /api/admin/settings  → { replicateApiToken, jigsawApiKey, modelVersion, replicateEnabled }
POST /api/admin/settings  body: { ...settings, newPassword? }

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Architecture

pages/
  [[...slug]].tsx          Main translation page (Text + Document tabs)
  admin/index.tsx          Admin settings panel
  api/
    admin/
      auth.ts              JWT-based admin authentication
      settings.ts          Settings read/write (requires admin auth)
    translate/
      replicate.ts         Replicate AI translation endpoint
      document.ts          Document upload & translation endpoint
    v1/[[...slug]].ts      Original REST API
    graphql.ts             Original GraphQL API

components/
  DocumentTranslator.tsx   File upload UI, progress, download
  ColumnSelector.tsx       Per-sheet column selection for Excel/CSV
  Header.tsx               + admin gear icon link

utils/
  settings-store.ts        Read/write data/settings.json
  admin-auth.ts            JWT sign/verify helpers
  replicate-translate.ts   Replicate API calls + batch helper
  document-processors/
    excel.ts               SheetJS Excel/CSV processor
    docx.ts                JSZip + XML DOCX processor
    pdf.ts                 pdf-parse + pdf-lib PDF processor

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Docker

FROM node:18-alpine
WORKDIR /app
COPY . .
RUN npm install && npm run build
EXPOSE 3000
CMD ["npm", "start"]

Or using the included Dockerfile:

docker build -t lingvai .
docker run -p 3000:3000 \
  -e ADMIN_PASSWORD=secret \
  -e ADMIN_JWT_SECRET=random \
  -v ./data:/app/data \
  lingvai

Mount ./data as a volume to persist admin settings across container restarts.

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Tech Stack

Layer	Technology
Framework	Next.js 12, React 18, TypeScript
UI	Chakra UI 2, Framer Motion
Translation (default)	lingva-scraper (Google Translate)
Translation (AI)	Replicate + JigsawStack text-translate
Document processing	SheetJS (xlsx), JSZip, pdf-lib, pdf-parse
Admin auth	jose (JWT), HTTP-only cookie
File uploads	formidable v3
API	REST + GraphQL (Apollo Server)

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License

AGPL-3.0 — same as the upstream Lingva Translate project.

Original project by thedaviddelta. LingvAI enhancements: admin panel, Replicate AI integration, document translation.