More language choices in staging environment

[roschaefer]

Is your feature request related to a problem? Please describe.
We have a couple of people who are passionate about contributing translations, including Spanish, Italian and French. Take @360fun as an example. We would like to accept more language contributions but we don't want to slow down development, in case a translation is not 100% finished. Therefore we want a switch in which we can opt-in to more language in staging environment but enable only EN and DE for production.

Describe the solution you'd like
An environment variable should define the list of choosable languages:

# this should enable German, English, Spanish, Italian and French
LANGUAGES=de,en,es,it,fr yarn run dev

The fallback for missing translations should be EN.

Describe alternatives you've considered

Environment variables are necessary because this is the only thing we can change in deployed environments, where we cannot change config files.

Additional context

[360fun]

Cool! :)

[appinteractive]

@roschaefer this is Great thanks. 👍

[erhardtstiefel]

I understood the issue but since I'm a novice in this area I'd like to be included in the solution process by a personal message. Thanks.