[Feature Request] Allow input of non-English characters into TextEntry

[JustMoneko]

Currently, the game does not respect alt-gr input in text entry, which makes it impossible to write some characters (in my case Polish ones).

In practice, it means that it is not possible to search for some songs in the new alpha 5 theme, as well as the only way to rename a profile to include non-English characters is to edit save files directly in something like a notepad.