Created attachment 244962 [details] [review]
language: Add some likely relevant languages to the initial list

We can reuse this otherwise unused function to add the current
environment locale and other user accounts' languages to expand our
initial list of languages a bit and make it more likely to be
immediately useful without having to expand to the full list.

Review of attachment 244962 [details] [review]:

OK. Does this need a g-c-c resync?

(In reply to comment #2)
> OK. Does this need a g-c-c resync?

It wouldn't hurt but wouldn't have any pratical effect since g-c-c
already always shows the currently set user account language in the
initial list.

g-i-s otoh, runs either in its own special account or when initially
logging in and, in both cases, doesn't have a language set in
AccountsService yet.

Attachment 244962 [details] pushed as 04d8f07 - language: Add some likely relevant languages to the initial list