Ok, I had Fatal error: Class ‘Translations’ not found in wp-includes/l10n.php on line 408
after reinstallation and control of files I finally found my error: I kept the previous wp-settings.php thinking it was one of my config file to keep.
Actually, you only have to keep wp-config.php and replace wp-settings.php with the new one…
I hope it will help some of you with the same issue !
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