After updated lumia 720, app lists shortcut got unneccesary language

After update, the app list shortcut (when you press an alphabet in apps list) got another alphabets from the language in you regional format (in my case, Thai)
which is unnecessary, there is no app with name in Thai (or any other than English)

The Thai alphabet disappear after I change regional format to United State. (When I change to Russian, it is also show Russian alphabet)
Is there any other way to get rid of foreign alphabet in app list shortcut

Attachment 44799

Thank you