Add missing helptext default parameter content_image

git-svn-id: http://svn.cmsmadesimple.org/svn/cmsmadesimple@8843 3d254a34-79dc-0310-9e5f-be208747d8a0
Add missing helptext default parameter content_image

git-svn-id: http://svn.cmsmadesimple.org/svn/cmsmadesimple@8844 3d254a34-79dc-0310-9e5f-be208747d8a0