An issue with this is when articles exist in another language, but you can't link it. Nowadays it isn't as easy as just filling in that O is the Dutch article a

An issue with this is when articles exist in another language, but you can't link it. Nowadays it isn't as easy as just filling in that O is the Dutch article about what is called Eaux in French, you need to visit another Wikimedia project called wikidata and enter a translation there. But if the target name, O, is already in use, you need to first find a new data object name for O and migrate the wikidata object to the new name and then create a new one for the translation of Eaux. Or maybe the problem was that the wikidata ID for the Dutch article was already linked to something else (so O points to wikidata ID 123 and Eaux points to wikidata ID 321). Either way, you need some migration which first orphans one of the two sides iirc. It has been a few years so I forgot the details, but this is where I ran into some wall. I think you need special permissions for it and there's a gigantic backlog of such requests, essentially it never happens and so articles remain untranslated and unlinked. For some languages like German, there's another translation site with human-vetted translations: https://dict.cc https://dict.cc. It has support for language pairs beyond DE<>EN but those are pretty limited and iirc the suggestions queue always full. Not that DE<>EN is flawless but it's good and virtually always more helpful than DeepL or Gtrans