Nested translation key changes

[dunkyl]

• allTranslations is only accessed in the context of a known locale

  • transposed? (e.g. top level is locale) to match input format
  • but this is the shape of discord's translations. Keep.

• loadTranslations only loads from res://

  • and only called in TranslationProvider()
    -> can assume initial state is clean

• Java doesn't have nice unions for a Node = Map<String, Node|String> ish thing

  • translations are never written to at runtime
    -> yaml files are flattened in loadTranslations()

• Supported locales is 1:1 with $locale.yaml
  -> removed locales array param
  -> discovered during loadTranslations

-> translation shape issues throw an exception