"English (UK)" is not accepted as a "topic language"

I just created a new topic in the support section.
And I couldn’t get it published because the “English (UK)” tag is not accepted — only “(US)”. Not being native, I don’t really care and I choose the first one under my mouse. It took me many tries to understand what was happening!
This is the same here — only get accepted if you select “US”…

Same here, it took me ages to figure out what the problem was.