Add automated translation tools - Addresses #1494

TRANSLATION_TOOLS.md

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+# Translation Tools for JavaGuide
+
+This repository includes automated translation tools to translate all documentation to multiple languages.
+
+## Available Tools
+
+### 1. Python Version (`translate_repo.py`)
+
+**Requirements:**
+```bash
+pip install deep-translator
+```
+
+**Usage:**
+```bash
+python3 translate_repo.py
+```
+
+**Features:**
+- ✅ Uses Google Translate (free, no API key required)
+- ✅ Translates all `.md` files in `docs/` folder + `README.md`
+- ✅ Preserves directory structure
+- ✅ Progress tracking (saves to `.translation_progress.json`)
+- ✅ Skips already translated files
+- ✅ Rate limiting to avoid API throttling
+- ✅ Supports 20 languages
+
+### 2. Java Version (`TranslateRepo.java`)
+
+**Requirements:**
+```bash
+# Requires Gson library
+# Download from: https://repo1.maven.org/maven2/com/google/code/gson/gson/2.10.1/gson-2.10.1.jar
+```
+
+**Compile:**
+```bash
+javac -cp gson-2.10.1.jar TranslateRepo.java
+```
+
+**Usage:**
+```bash
+java -cp .:gson-2.10.1.jar TranslateRepo
+```
+
+**Features:**
+- ✅ Pure Java implementation
+- ✅ Uses Google Translate API (free, no key required)
+- ✅ Same functionality as Python version
+- ✅ Progress tracking with JSON
+- ✅ Supports 20 languages
+
+## Supported Languages
+
+1. English (en)
+2. Chinese Simplified (zh)
+3. Spanish (es)
+4. French (fr)
+5. Portuguese (pt)
+6. German (de)
+7. Japanese (ja)
+8. Korean (ko)
+9. Russian (ru)
+10. Italian (it)
+11. Arabic (ar)
+12. Hindi (hi)
+13. Turkish (tr)
+14. Vietnamese (vi)
+15. Polish (pl)
+16. Dutch (nl)
+17. Indonesian (id)
+18. Thai (th)
+19. Swedish (sv)
+20. Greek (el)
+
+## Output Structure
+
+Original:
+```
+docs/
+├── java/
+│   └── basics.md
+└── ...
+README.md
+```
+
+After translation to English:
+```
+docs_en/
+├── java/
+│   └── basics.en.md
+└── ...
+README.en.md
+```
+
+## How It Works
+
+1. **Scans** all `.md` files in `docs/` folder and `README.md`
+2. **Splits** large files into chunks (4000 chars) to respect API limits
+3. **Translates** each chunk using Google Translate
+4. **Preserves** markdown formatting and code blocks
+5. **Saves** to `docs_{lang}/` with `.{lang}.md` suffix
+6. **Tracks** progress to resume if interrupted
+
+## Example Workflow
+
+```bash
+# 1. Run translation tool
+python3 translate_repo.py
+
+# 2. Select language (e.g., 1 for English)
+Enter choice (1-20): 1
+
+# 3. Confirm translation
+Translate 292 files to English? (y/n): y
+
+# 4. Wait for completion (progress shown for each file)
+[1/292] docs/java/basics/java-basic-questions-01.md
+  → docs_en/java/basics/java-basic-questions-01.en.md
+    Chunk 1/3... ✅
+    Chunk 2/3... ✅
+    Chunk 3/3... ✅
+  ✅ Translated (5234 → 6891 chars)
+
+# 5. Review and commit
+git add docs_en/ README.en.md
+git commit -m "Add English translation"
+git push
+```
+
+## Progress Tracking
+
+The tool saves progress to `.translation_progress.json`:
+```json
+{
+  "completed": [
+    "docs/java/basics/file1.md",
+    "docs/java/basics/file2.md"
+  ],
+  "failed": []
+}
+```
+
+If interrupted, simply run the tool again - it will skip completed files and resume where it left off.
+
+## Performance
+
+- **Speed**: ~1 file per 5-10 seconds (depending on file size)
+- **For JavaGuide**: 292 files ≈ 2-3 hours total
+- **Rate limiting**: 1 second delay between chunks to avoid throttling
+
+## Notes
+
+- ✅ Free to use (no API key required)
+- ✅ Preserves markdown formatting
+- ✅ Handles code blocks correctly
+- ✅ Skips existing translations
+- ⚠️ Review translations for accuracy (automated translation may have errors)
+- ⚠️ Large repos may take several hours
+
+## Contributing
+
+After running the translation tool:
+
+1. Review translated files for accuracy
+2. Fix any translation errors manually
+3. Test that links and formatting work correctly
+4. Create a pull request with your translations
+
+## License
+
+These tools are provided as-is for translating JavaGuide documentation.