Steps to reproduce
- Set UI language to German in prefs
- Go to https://www.wikidata.org/wiki/Q1833362 (or https://www.wikidata.org/wiki/Q1833362?uselang=?? to simplify making an edit in another language, where ?? can be any language code.)
- Edit the page (as it is a species, adding 'Myotis ciliolabrum' as the label to any language is a sensible edit)
- Visit https://www.wikidata.org/wiki/Q1833362?uselang=en
Expected results:
The UI in step 4 should always be in English.
Actual results:
Parts of the UI are in the UI language of the last contributor to the page; in this case, German.
This is happening to many edits. Log out and click through the items on https://www.wikidata.org/wiki/Special:RecentChanges which are from someone whose UI language is likely different from 'en'.
Version: unspecified
Severity: major