How to change language in WinRAR
Unfortunately, you can't change the language in WinRAR using the settings; each language has a different version of the archiver. So if you want to change the language of WinRAR to English, for example, you need to do the following:
Remove the current version of the archiver from your PC.
Download WinRAR in English and install it.
If you need the archiver in another language, you will need another version of the installation file. All in all, WinRAR has more than 40 localizations, the complete list can be found on the official site.