When I type non-English text in the Event editor or in properties of the text object it looks fine, but on the Scene and when I run the program the text is unreadable.
Game Develop doesn’t fully support unicode characters, I’m trying to find a solution to fix that.
It seems it’s not currently possible to handle Unicode characters the way GD is made.
Solution here: viewtopic.php?f=22&t=4753&start=10
(Set system locale to your language, have translation folder in GD/locale (ru_RU for example) and select your language in File-Properties-Language.)