I recently had a question retagged from "Yogurt" the American spelling to "yoghurt" the British one. I can see this easily becoming a fairly epic war. As an American I was momentarily infuriated by the change. Yogurt is a legit tag, as is Yoghurt. My spellchecker is set to US English and Yoghurt gets flagged. Yogurt does not. Removing Yogurt from the tags to replace it with Yoghurt just seems arrogant to me. No your spelling is no more correct than mine. And I want my Yogurt question tagged in such a way that I'll know what to look for.
We either need to decide on a standard - American English, British English for tags - or just use both. IE. Yogurt and Yoghurt. Personally, I'm in favor of using both. Where there's a spelling conflict use both tags. That way Americans can come and find what they are looking for and so can Brits.