Weird characters ins 3.0.0

Greetings.
I install the 3.0.0 version and found weird characters on UI. My language and system is portuguese. How I can solve this, without change all my system to adapt for one software? There’s some screenshots:

[attachment=0]3.PNG[/attachment]

[attachment=1]2.PNG[/attachment]

[attachment=2]1.PNG[/attachment]