qa/1251: set $LANG for man(1) command
qa/1251: set $LANG for man(1) command

Addresses a CI failure mode.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp