feature(aalborg_theme): comments use triangle indicator instead of text label

Fixes  #7161
Merge pull request #7285 from PerJensen/comment_style_change

feature(aalborg_theme): comments use triangle indicator instead of text label
feature(admin): Use elgg_view_menu to generate admin header
Merge pull request #7288 from PerJensen/admin_header_menu_new

fix(views): removes hard coded menu from admin header