Impossible to change language in the first screen

[Richard Eitz]

I was showing Kalium to a friend today and had a bit of a problem with the language as it didn't work quite as expected.

It's actually two problems in this issue:

• The initial screen, in my opinion, should let the user change the language of the app (currently not possible) if its not the one they expect.
• The system default language did not work to match the users' cellphone language (defaulted to english anyway, cellphone was pt_BR). Probably because the language available in Kalium is "pt" and not "pt_BR", so some mapping would have to be created.