Thanks for contacting us.
JustCode supports all kinds of VS language packs versions. We are aware of some keyboard profiles issues with Turkish keyboard, but nothing serious.
So feel free to install it and give it a try.
Regarding other Telerik products, I could say that they should work properly with different languages too.
Please, do not hesitate to contact us if you have any further questions or need of assistance.
the Telerik team
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