Reading `man man`, it appears you should change your environmental variables and then use man as usual. If it is not there in your language, it will still show the English version.

       International support is available with this package.   Native  lan‐
       guage  manual pages are accessible (if available on your system) via
       use of locale functions.  To activate such support, it is  necessary
       to  set either $LC_MESSAGES, $LANG or another system dependent envi‐
       ronment variable to your language locale, usually specified  in  the
       POSIX 1003.1 based format:


       If  the  desired  page  is available in your locale, it will be dis‐
       played in lieu of the standard (usually American English) page.