- Add properties_ru JSON field to store translated category, crystal_system,
luster, streak, specific_gravity, color_description
- Add translate_minerals management command using deep-translator (Google
Translate), with a hard-coded dictionary for crystal systems
- Template: show translated values in RU mode, fall back to English if missing
- Add deep-translator to requirements.txt
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
