Add missing languages to language selector

[Nikerabbit]

It looks like (almost?) none of the languages translated in translatewiki.net have been made available to users:

• https://github.com/Ajapaik/ajapaik-web/tree/master/ajapaik/ajapaik/locale
• https://github.com/Ajapaik/ajapaik-web/blame/master/ajapaik/settings/default.py#L80