Languages

By default the UI follows your browser's language. This is the Auto setting, which takes the first language in the browser's preferred list with a translation, matching a regional variant to its base language when there's no exact match (so it-CH gets Italian), and falls back to en_US when none match. Visitors who aren't signed in, such as in Kiosk mode, always get Auto.

Picking a specific language overrides Auto. The choice is stored server-side with your other UI settings, so it follows you across devices, and switching back to Auto lets each browser follow its own language again.

Supported locales

Code	Language
en_US	English (United States), default
en_GB	English (United Kingdom)
es_ES	Spanish (Spain)
fr_FR	French
de_DE	German
it_IT	Italian
pt_BR	Portuguese (Brazil)
ja_JP	Japanese
ko_KR	Korean
ru_RU	Russian
pl_PL	Polish
cs_CZ	Czech
hu_HU	Hungarian
ro_RO	Romanian
bg_BG	Bulgarian
zh_CN	Chinese (Simplified)
zh_TW	Chinese (Traditional)
tr_TR	Turkish

What gets translated

• All UI strings: menus, buttons, labels, tooltips, dialogs
• Error messages and notifications
• Help text and inline instructions

Not translated:

• Game metadata: titles, descriptions, and genres come from metadata providers, and English is usually the source language. IGDB has some localisation, but coverage is uneven.
• Your own content: collection names, notes, user-uploaded media

Contributing a translation

Add missing strings to an existing locale

1. Fork rommapp/romm.
2. Under frontend/src/locales/<your-locale>/, open the JSON/YAML files.
3. Add the missing keys (they're all present in en_US for reference).
4. Open a PR.

Add a new locale

1. Create frontend/src/locales/<your-locale>/ by copying the structure from en_US.
2. Translate.
3. Register the locale in the frontend/src/locales/index.ts file (the filename may change, so follow the pattern in the repo).
4. Open a PR.

See Translations (i18n) for the full contributor walkthrough.