With the Wiki Publisher extension installed, "Tools - Options... - Internet" does not list the "MediaWiki" page. (The page is there, but it has no name, so that it is well hidden in the dialog.)
Stephan Bergmann committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=aebf5bf22304c73e121b16dc0b51f909c5f34c28 fdo#52232 ConfigurationSet wrapper unusable for localized properties
Stephan Bergmann committed a patch related to this issue. It has been pushed to "libreoffice-3-6": http://cgit.freedesktop.org/libreoffice/core/commit/?id=10ae81acb68ba6e03cfe8907d8a0a1ea33067376&g=libreoffice-3-6 fdo#52232 ConfigurationSet wrapper unusable for localized properties It will be available in LibreOffice 3.6.1.
Stephan Bergmann committed a patch related to this issue. It has been pushed to "libreoffice-3-6-0": http://cgit.freedesktop.org/libreoffice/core/commit/?id=734b653a95a88478ca53d7010aefc82ad78f6740&g=libreoffice-3-6-0 fdo#52232 ConfigurationSet wrapper unusable for localized properties It will be available already in LibreOffice 3.6.0.
Stephan Bergmann committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=cef66a3eed301ab77e02be6d6ba148142051e13d Revert "fdo#52232 ConfigurationSet wrapper unusable for localized properties"
VERIFIED FIXED in LibreOffice 3.6.1.1 (Build ID: 4db6344) on MacOS X 10.6.8 (Intel), German langpack installed.