I'm aware the above example might be controversial, but this is part of what we would like to understand.
We want to make sure we support communities with the languages they are most comfortable with.

For Esperanto the only other option than English that would make sense is to have a fallback language selected by the users themselves.

Hey @joopkieftelapingvi , thanks, that's good to know. We can't support this at the moment, so unless you want to name a closer language, we'll leave it to default to English

The example you gave, by the way, is for example what Microsoft uses.

In Portuguese-Brazil case, even though Spanish structure being much closer than English structure, many words in Spanish when looks similar have a complete different meaning (e.g.: pregnant in Spanish is embarazada, and in Portuguese this word is pretty close to embaraçada, which means tangled). On the other hand, Brazilians are much more used to English than Spanish due to the imperialism, ops, neologisms through movies, software products, brands and so on (e.g.: online, website, e-mail, rock and roll are the same in Portuguese, and other words as delete and scanning recently came to be deletar and escanear). Laugh allowed.

So, for Portuguese speakers, when there is a translation missing, the ‘falls-back’ should be kept to English.

By the way, certainly for Portuguese-Portugal it would be better ‘falls-back’ to Portuguese-Brazil.

For German there is no need to have another fallback language than English.