Convert to json does not decode cyrillic strings

Describe the bug Convert to json for localization files does not decode cyrillic symbols properly

To Reproduce Steps to reproduce the behavior:

1. Add base\localization\ru-ru\onscreens\onscreens_final.json to project
2. Do Convert to JSON
3. Resulting json will have femaleVariant strings decoded like \u041D\u043E\u0432\u043E\u0441\u0442\u0438

Expected behavior Strings decoded as cyrillic

Version (please complete the following information):

• Version 8.16.1

Same issue happens for at least Korean

See #1757

encoding as utf8 bytes/raw instead of escaped unicode will add control bits needed for multibyte character recognition, on both native/.non native os.