Provide UI-language via API

[zeitschlag]

Pitch

Is there an API to determine the language set by the user under /preferences/appearance? I'm asking as this seems to have an effect on translations?

There doesn't seem to be an API-endpoint to fetch the UI-language set by the user under /settings/preferences/appearance. This language seems to have an effect on translations.

When I set this language to German and want to translate a German toot from the iOS-app, I get a HTTP status-code 403 and a JSON that looks like this: {"error": "This action is not allowed"}. Translating an English toot works.

If we knew this UI-language in the app, we could hide the "Translate"-option from the user. If we don't know that language, the only, but unreliable way I can think of, would be to use the device-language.

Regardless of providing this value via API, you could also think about letting the translation-services "translate" from language A to language A so that translate doesn't return an error/403.

Thank you!

Motivation

• 3rd-party-developers who want to use the built-in translate-function in their apps, would benefit from this.
• Mastodon for iOS could hide the translate-option for those status-posts (and I'm pretty sure that Android could benefit from this, too!)