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Hello @konradpiotr,
Thank you for contacting Rank Math support.
Yes, Rank Math can help you optimize your website and supports other languages as well.
It is also compatible with some popular multilingual plugins that many websites use to translate their sites.
You can check these links for more information:
https://rankmath.com/kb/wordpress-multilingual-seo-with-rankmath-weglot/
https://rankmath.com/kb/multilingual-seo-wpml/
https://rankmath.com/kb/multiple-languages-seo-rankmath-translatepress/
Hope that helps.