Six new language translations.

Added languages:
* Turkish
* Spanish
* Bulgarian
* Romanian
* Norwegian
* Partial Hindi

Improvements:
* German
* Added comments on ui_dropdown.h file with English language names.
* Keep "..." consistent between languages.

Credits:
* @KingHual for Bulgarian
* Irina "Kish" for Romanian
* "CocoCuddlesKitty" for Spanish
* "Tore" for Norwegian.
* Fenasi Kerim for Turkish
* Arjit Chaudhary for Hindi