Partially resolves #544

Ensures that there shouldn't be anything in Ore stopping us from beginning to localize it. Technically WIP because I haven't tested if it works, and auth needs changes to make the language switchable.

I took the liberty to apply the boy scouts rule as I saw fit while working on this PR.

Stuff which might not work or display correctly with other locales.

• Stuff not entered in the messages file (Don't think there is much that falls under this one)
• Stuff where the parameters should be passed to the messages file
• Other things I can't think of currently

EDIT: Tested this and the basics should work

For now it only works if the language is set in the browser. Auth needs changes so that a user can change the language too.

To add a supported language:

1. Add it to play.i18n.langs in the config.
2. Create a messages. file that sits besides the messages file.