Fixed menu file paths, some of them were absolute.
Use the h function instead of htmlspecialchars in concrete/dashboard/sitemap helper
Translate system page names in dashboard full-sitemap
missing t function
change htmlspecialchars to helper
Work on Groups
Revert Tree Work

Revert Tree Work for now.

This reverts commit e9b1d508be76988a7dd12459aa5e963aa9f615bd.
Revert "More tree node work and group work"

This reverts commit 4211bdf6d33303063236ae376e8d2fc575c1298b.
Revert "including tree node classes"

This reverts commit 7be22365df468fe7ec192ed6192cb0fbb3fbc730.
Merge pull request #1412 from mkly/revert_tree_work_commits

Revert tree work commits
Merge pull request #1348 from ojalehto/fix/concrete-interface-menu-helper/menu-file-urls-from-absolute-to-relative

Fix menu file paths, some of them were absolute.
Merge pull request #1409 from hissy/t-function

Add t() function and little more cleanup
Merge pull request #1408 from hissy/localize-full-sitemap

Translate system page names in dashboard full-sitemap