XF 2.0 Admin header disappears, admin footer badly displayed

I didn't have English language anymore
I do not have any add-on activated...

But... i was installing an addon when the bug came, the FontAwesome5 addon.
I desactived it, uninstalled it, delete files from server but no change... I re-upload the files, install it again, but bug still here
 
Style, caching, custom template edits? Is it happening at a specific time at the night?
(y)
Referring back to last night's message, i posted at 11:23 PM and today at 11:30 PM
this seems to correspond to the automatic test of the files, 3924 in my case. but if I check manually nothing happens

NB: the results is always successful, no missing file or corrupted file
 
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