Add translations for 6 languages (de, es, fr, ja, ko, pt-BR)
Translate 200 strings to German, Spanish, French, Japanese, Korean, and Brazilian Portuguese, bringing localization coverage from 35% to 95%. Also adds translation helper script for future localization work. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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