Based on the input, it seems that DeepL provides high quality translations for the languages it supports (26 languages as of now). Although it may not cover new languages compared to the existing services available in Content Translation it may be worth considering because of the quality improvements.
|Open||None||T76456 Language Engineering tracker of trackers (tracking)|
|Open||None||T76454 [Epic] ContentTranslation - MT support|
|Open||None||T86700 Add more machine translation services (tracking)|
|Open||None||T301561 DeepL MT for Content Translation|