Meguro Writer admin UI language packs.

Supported in v3.3.0:
- Japanese
- English
- Chinese (Simplified)
- Chinese (Traditional)
- Korean
- German
- French
- Italian
- Spanish
- Portuguese

The admin UI follows the current WordPress user/admin locale automatically.
For non-Japanese locales, any helper text without a native translation falls back to English.
Country and region names use the existing English labels outside Japanese.

Article-generation language is configured separately in Meguro Writer settings and does not depend on the admin UI language.
Text domain: meguro-writer
