Encoding problems with German man pages

On the machine I am working on I have English man pages under /usr/share/man/and German ones under /usr/share/man/de. The former are encoded with us-ascii, the latter ones with utf-8. Unfortunately some special characters (Umlaute) in the German man pages are not displayed properly when calling $ man some_command_with_german_manpage with my current settings. What are the correct settings in /etc/man.conf to resolve this issue? At the moment I have the following (omitting lines that I do think are not relevant): TROFF /usr/bin/groff -Tps -mandoc NROFF /usr/bin/nroff -Tps -mandoc -c JNROFF /usr/bin/groff -Tnippon -mandoc EQN /usr/bin/geqn -Tps NEQN /usr/bin/geqn -Tlatin1 JNEQN /usr/bin/geqn -Tnippon TBL /usr/bin/gtbl # COL /usr/bin/col REFER /usr/bin/refer PIC /usr/bin/pic VGRIND GRAP PAGER /usr/bin/less -isR BROWSER /usr/bin/lynx HTMLPAGER /usr/bin/lynx -dump CAT /bin/cat $ locale returns the following: LANG=de_DE.utf8 LC_CTYPE=en_US.UTF-8 LC_NUMERIC="de_DE.utf8" LC_TIME="de_DE.utf8" LC_COLLATE="de_DE.utf8" LC_MONETARY="de_DE.utf8" LC_MESSAGES="de_DE.utf8" LC_PAPER="de_DE.utf8" LC_NAME="de_DE.utf8" LC_ADDRESS="de_DE.utf8" LC_TELEPHONE="de_DE.utf8" LC_MEASUREMENT="de_DE.utf8" LC_IDENTIFICATION="de_DE.utf8" LC_ALL=