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There seems to be a regression of Unclear wording on pages of post- and tag-associated badges that can be earned once (confusing text for one-time-rewarded badges):
That is, it is expected to display "earned this badge".
Is this deliberate?
Aah, lost in translation..
This bug was (re-)introduced as we cleaned out all the pluralization - or rather singularization - logic from our views. Watch for build numbers DATE.1678 on meta and DATE.1175 on sites.