- Special:Translate (maybe)
- Many other special pages with forms
This has been done for existing styled buttons for example in I3cae34f96f and in other commits.
There are some more places where unstyled buttons are used (e.g. Special:TranslationStats), but those should be updated as a whole.
I did just a quick refresh on the task description, did not check everything. I'd assume that everything that is a *regular* button on Special:Translate is already converted, but I did not verify. Out of my head:
Feel free to mark it as done.