Support more languages

[majoer]

Description

FetchApplicationTexts only fetches nb, nn and en languages as of now. This means the adapter ignores other languages, even if users add them via studio.

Blocked:
We lack a way to determine which languages the application supports. We don't want to send 1 GET request for each language for each app, just to check if it's set.

Suggestion 1:
We can use application metadata to check which lanugages the application title has and assume these are all languages for this application. This solution requires no additional api-calls.

Blocked: Suggestion is also blocked because studio only adds nb, nn and en to the title, regardless of what language files exist under /App/config/texts. We would need Studio to either:

1. Unify application metadata title languages with the language files present, or
2. Add a new metadata field that reflects what language files are present

Suggestion 2:
A new endpoint in storage to tell us which languages are supported for each app. e.g.
/storage/api/v1/applications/:org/:app/supported-languages

Additional Information

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Tasks

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Acceptance Criterias

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