RTL: fix position of help icon in filter_horizontal m2m widget

--HG--
extra : rebase_source : a201efaee395d8d3bff8e88799c30830346a9e2b
Don't use ugettext_lazy for form field labels since Django will double-escape them. Closes #682.
Added to list of sites using Mezzanine.
Move case-insensitive keyword creation into KeywordManager, and allow for duplicate results. Closes #679.
Fix ADD_PAGE_ORDER. Closes #681.
Merge
Fix uses of next param for redirects where param exists but value is empty.
Fix invalid migration
Revert fix to #594 #677 - causes issues with status messages.
TagCloser - don't close br and image tags
Test changes to TagCloser
Added John Groszko to AUTHORS
Merge
Added sanimedicaltourism.com to sites in README.
Clean up some docstrings
When using search against an abstract model (eg Displayable), filter the combined models searched against by the models represented in the SEARCH_MODEL_CHOICES setting. Closes #684.
Add a note to search docs about SEARCH_MODEL_CHOICES affecting abstract search behaviour.
Provide default styles for RICHTEXT_ALLOWED_STYLES as explicitly required by features in TinyMCE. Closes #690.
Added missing class to collapsible navbar that affected nested menus
SS: Moved to the original