[Risolto] I can not remove my translated Language

Background of the issue:
I need to create a site in English only on the subdomain demo.derminix.com.tr and then clone it to another location. Since it will be single-language, I switched from my native language, Turkish, to English. However, unfortunately, I am not processing any data in Turkish. Can you help me? Also you can check error on link nascosto

Symptoms:
I can not remove my translated Language.

Questions:
How can I remove the Turkish language from my site?
Why am I not processing any data in Turkish after switching to English?