Allow diacritics in display name
Diacritics (accent marks over/under/around letters; e.g. ú, ÿ, ç, å, ē) are important in spelling rules for many languages. There are a number of situations where a diacritic can be the difference between a common word and a horribly inappropriate one.
The display name field on Twitch should be extended to allow diacritics alongside capitalization changes to a username. This would add at least some level of support for a large number of additional languages with a relatively simple change.

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CoenKontkin commented
Can someone please help me with it?
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CoenKontkin commented
Well, my real name is Coën, but i cant put a dubble dot on the e. I want to call myself CaptainCoën, but i cant do it. Can you help me with it please? I really want it, and i dont know why you guys blocked it.