Add gettext support for svnserve and use svn_cmdline_fprintf instead of fprintf.
Add gettext support for svnserve and use svn_cmdline_fprintf instead of
fprintf.

* subversion/svnserve/main.c
  (svnserve__options): Mark all documentation strings for options with N_().
  (usage): Add a pool, which is necessary for the replacement of fprintf by
    svn_cmdline_fprintf, to arguments.
  (main): Refactor an error message for translators' convenience.

Approved by: lundblad

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion