GitLab

- Restore Gravatar functionality
- Add new button for "Use Initials"
- Set both buttons to use text-left class
- Update toast property autoClose to duration (wrong library, my bad!)
- Update toast messages to clarify that this isn't "Gravatar" but "avatar"
- Add i18n text to en-US/translation.json

Translation values for en-US are not necessary, the keys will be
used as fallback.

added simplified + traditional chinese, updates uk keys, changed standart language code format to xx-XX