I can confirm that the issue persists and that it also involves bad interpretation of the file names – localized File: prefixes for files on Commons, such as "Fichier:" (fr) or "Soubor:" (cs) are not translated and a "missing link" is therefore reported, although images are displayed correctly during the editing.

It is misleading behavior, in the first place, that galleries are included in the text to be translated, but they are untranslatable in practice. I would expect neither or both, but not such a paradox.