UTF-8 characters in Text Render

I’m using API (written in PHP) with PHP (+ all files) and MySQL set to UTF-8. My Visual Studio C++ is set to UTF-8 too (code in files). But I’m getting the ?? chars in UE4 (Text Render) instead of UTF-8 characters. What am I doing wrong? Maybe I missed some settings… I would ask for help? I want to get texts in UTF-8 but something is wrong.