Overleaf Supports Multilingual Typesetting
Overleaf and LaTeX have support for a large selection of languages. These include Arabic, Chinese, French, German, Greek, Italian, Japanese, Korean, Portuguese, Russian, and Spanish.
Multilingual typesetting on Overleaf using polyglossia and fontspec
How to Write Multilingual Text with Different Scripts in LaTeX (Arabic, Sanskrit, Hindi, Chinese, Japanese, Korean, Greek and Thai)