Hello Language option

in Localization
Hello, How are you? Where exactly do we add the language option? I added Locales. He's here, but he's not working. The words for the Turkish language are actually correct, but they don't work. What should I do?
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I also have to point out that this software is very beautiful and great.
any one help me ?
Installing locales is described here
https://success.vanillaforums.com/kb/articles/231-translating-vanilla
what is wrong here? I couldn't make it. I tried alt hyphens and normal hyphens.