If you add a file in VisualEditor, then it sometimes adds the file using the English namespace or other English terms. Examples:
https://ca.wikipedia.org/w/index.php?diff=14187112&oldid=14185423 – "File" is not a Catalan word
https://es.wikipedia.org/w/index.php?diff=77684034&oldid=73098946 – "File" is not a Spanish word
https://de.wikipedia.org/w/index.php?diff=135103424&oldid=135103377 – German uses "mini" instead of "thumb"
https://ro.wikipedia.org/w/index.php?diff=8882945&oldid=7944846 – "File" is not a Romanian word
In other cases, it did use the local name, including French, Hungarian, and Estonian. I'm not sure what the common thread is. It's possible that some of these communities deliberately choose to use the English namespace, but at least a few change such edits. If we can use the local name more often, then we should be able to reduce the burden on local communities.