Forum rank has multilang right 'rank_language'. You need to define it. Just checked git forum infusion.php
I cant possibly guess Rank ID 1,7,9,20 is Superadmin English, Superadmin Russia, Superadmin Chinese... etc belongs to User X. Repeat on Rank ID 2,7,77,98,204 for User X2.
Ranks differ on each site on upgrade.
On clean install, mlt rank do apply and was assigned for all language. You need to micro assign them manually for upgraded sites.
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