feat: add Gen Z language translations

- Added ridiculously Gen Z-ified translations for all i18n namespaces
- Created common.json with slang-heavy translations for UI text
- Created embeddings.json with Gen Z versions of technical errors
- Created marketplace.json with casual marketplace translations
- Created mcp.json with Gen Z MCP server messages
- Created tools.json with Gen Z tool-related messages

All translations maintain the same structure and interpolation variables as the English versions while adding heavy Gen Z slang and expressions.

Author: roomote