See below:
As you can see, every badge is translated except for the “Post Approved” one. It’s not that big of a deal, but it’s definitely a bit annoying and inconsistent.
Thanks 
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That’s because the rest of the badges are Discourse-default and Discourse is translated in several dozens of languages.
I wouldn’t expect Roblox to translate devforum-specific content into other languages especially since this badge seems deprecated (it doesn’t show up on the main badges page anymore).
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