"English" is not appearing in some contexts related to lexemes on Wikidata, in the `en` and `qqx` localizations only, as reported in [[ https://www.wikidata.org/wiki/Wikidata:Project_chat#T243705 | this discussion on d:Wikidata:Project chat ]].
* `en`: "Unknown language" appears instead of "English" at [[ https://www.wikidata.org/w/index.php?search=chat&ns146=1&uselang=en | Special:Search ]], and "Q1860" appears instead of "English" on lexemes.
* `qqx`: "wikibaselexeme-unknown-language" appears instead of "English" at [[ https://www.wikidata.org/w/index.php?search=chat&ns146=1&uselang=qqx | Special:Search ]], and "Q1860" appears instead of "English" on lexemes.
This does not happen for languages that are not English (e.g. "French" for lexemes in French), and does not happen when the interface is localized into a different language (e.g. "anglais" with `uselang=fr`).
The reason for this is not clear.