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Studio 2019 user interface language bug

Hi, 

This is not a life-threatening bug, but it is still quite annoying:

When I installed my copy of SDL Trados Demo, it was in Russian; since I prefer using English as UI language, I changed it immediately. However, unlike Studio 2017 in which every single element of the user interface was in a proper language, I had a mish-mash of languages: the majority of the UI elements were in English (menus, ribbons etc.), some of secondary elements (e.g. Advanced Display Filter window) was and is (after I purchased my copy) still in Russian. Opening and closing the window didn't help.

Moreover, I tried to change the UI language into some other language (Italian) - and got a mixture of languages (Russian, English and Italian); certain elements changed their language when I pointed at them with the mouse pointer, but not before. Again, the menus and the ribbons were in Italian, but many secondary windows were still in English.