Knoppix has a 'special edition' English & German OpenOffice version which also has no help files (to save space). Best way to correct this is to remove this openoffice & install the standard version.
Also see this http://www.knoppix.net/forum/viewtopic.php?p=77926 for more hints on language setting. You can also save a bunch of space by apt-get remove kde-i18n* which will remove about 100 meg of kde alternate language support files.