How to change character encoding in windchill

I'm trying to make my windchillda menus in Turkish, but it doesn't read Turkish characters. I added encoding utf-8 to navigation xml files, but it didn't work. How else can I do?

I'm trying to make my windchillda menus in Turkish, but it doesn't read Turkish characters. I added encoding utf-8 to navigation xml files, but it didn't work. How else can I do?
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