[FEATURE] Add languages page for selecting additional locales

[axtloss]

Is your feature request related to a problem? Please describe. Currently jade gui only allows using one locale, this limits bilingual people who may want to use multiple languages/formats on their crystal installation.

Describe the solution you'd like A page for extra languagues/locales that allows selecting multiple locales.

Describe alternatives you've considered Enabling all locales on install, but this takes way too long.

Additional context Feature originated from https://github.com/crystal-linux/.github/issues/5