When I press "." it writes "/" Somehow I do something that I don't want then when I press . it writes /. Because of this problem I cant scale my objects at the way I want.
Guys I figured out the problem. In blender tab my keybords language turns to English. But only in the blender. But not at the start. I think when I do my models I press some keys then it turns to English. Thanks to @Pullup I solved my problem.