Cant use some French letters

Hello!

There is an anoying issue regarding French letters. In French, we have these type of letter : éèêàâá and more with accent, and some special letters. And when try to use them, in a chat or in a command, the letters become invisible and if you try to continue writing, all following later will be invisible also.

For exemple:
(French words here)
Bonjour, j'ai mangé du pain.
(With the bug)
Bonjour, j'ai mang