Hi @AYKUT ,
Welcome to the forum! There is already a Turkish language subsection:
https://translations.roonlabs.net/lang/turkish
To help with the translation for the Roon app, you can look over the below instructions:
If you would like to help with translating ARC to Turkish, you can sign up for this here:
Also, if you would like to become a translation Admin for the Turkish language, please let me know, thanks!