On myxwiki, page http://tutos.myxwiki.org/xwiki/bin/edit/Invitation/WebHome has a “raw” title (ie it displays code).
I can not find the key used has page title in weblate = $services.localization.render(‘invitation.applicationsPanelEntryLabel’) .
The translation is in the page Invitation.Translations (source: https://github.com/xwiki/xwiki-platform/tree/053f0a2757cea18a5916632a58c6046ba61954cd/xwiki-platform-core/xwiki-platform-invitation/xwiki-platform-invitation-ui/src/main/resources/Invitation).
Can you check that you have this page in your wiki; and that it’s saved with a user having Admin rights (its scope if WIKI and thus requires admin rights).
hmm you do have it and it’s saved with a user being the wiki owner: http://tutos.myxwiki.org/xwiki/bin/view/Invitation/Translations#History
I don’t understand…
Neither do I 
.
Note that this wiki was still using XWiki Enterprise 9.3.1 flavor according to Extension Manager. I just installed XWiki Standard flavor 10.11 (which among other things upgraded invitation application). This specific issue looks OK now.
Thanks Thomas! The flavor install fixed this issue.