Region/country of where the alt-title comes from, whether using a TLD or language descriptor, is not to be used there.
So if I'm understanding right, the region tacked on the end is the problem?
"Yu-Gi-Oh! 5D's: Master of the Cards [EU]" should just be "Yu-Gi-Oh! 5D's: Master of the Cards" then, correct (without quotation marks obviously)?
If so, then I've run into another issue where mods aren't on the same page. Previously I've been submitting edits on alt names and they were getting rejected by a mod because I was leaving the country/region in parenthesis "( )" instead of brackets "[ ]" but apparently the correct way this whole time was no country/region tacked on at all eh?