Add support for accented characters for profile names

[simon-videodock]

It seems the profile names currently cannot contain accented characters like ë, ç , á, etc.

The error message states "Your profile name can only contain letters", which isn't entirely correct since these are letters with accents.

Surprisingly, I was able to create a profile with a name containing a digit: J0hnny...

...which I expected wouldn't work, because the error message states I should only use letters.