Related issues:

• Cannot type in Chinese/Japanese - Add IME / Input Methods Editors #1767
• Please support Korean! #1892

Tasks:

• Windows part thanks to Support CJK input #5230 and [win] Support CJK input method manager (IMM) laf#147
• macOS IME
• Linux IME
• Support for RTL languages text #2355
• Launch native file dialog selector (and future IME) in background process #4412