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.