Admin broken for non-English languages

[GUI]

If your browser sends a non-English Accept-Language header that we support (Finnish, French, Italian, Russian, German, and Spanish), then the admin will completely fail to load.

This is due to us now supporting multiple languages, but we forgot to include the .js i18n files in the Rails asset precompile list, so the app is bombing with this type of error:

Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError: admin/locales/fi.js isn't precompiled

I think we just need to add these .js files to the precompile list. We should add better testing surrounding this into our integration tests.

[GUI]

This has been fixed in the v0.7.1 packages that have been released. More integration tests have been added to ensure all the languages function properly in the built packages.