Splited from T280972. See this backtrace:
LinguaLibre currently uses OAuthAuthentication derived from https://gerrit.wikimedia.org/r/c/mediawiki/extensions/OAuthAuthentication/+/251930/33 with some other changes that I will push soon.
Original message : Also, the translation on wiki pages cannot be edited. By clicking on "Save changes", an error appears. Try on one page. @Tgr , you may be interested in the result of the error Thank you in advance.