Board Thread:ROBLOX help and discussion/@comment-29780886-20160924223220/@comment-26512843-20170413014155

This isn't a glitch. You can still use accented letters on the WEBSITE (party chat, group walls, the forums,) but you can't use them in-game because Roblox has decided that... ... well, no idea, really. Perhaps they're afraid of people abusing it and using it to swear? It's a bit silly, honestly. I think that they're just lazy and don't want to add support for hundreds of new characters (they'd have to add support for Chinese and Thai and stuff like that, so...)

But yeah, I totally feel you; I can't type in French correctly and it really annoys me.