Merge pull request #5132 from EricDunsworth/v3.1-broken-link-fixes

Demos+Documentation: Fixed a few broken links.
Added missing demo and documentation pages (fixes #5131)
Merge pull request #5136 from pjackson28/addmissingpages

Added missing demo and documentation pages (fixes #5131)
Tables: Added sorting for currency and formatted numbers (fixes #5115)
Merge pull request #5158 from pjackson28/addmoretablesortingtypesv31

Tables: Added sorting for currency and formatted numbers (fixes #5115)
Removed links from footer headings
Merge pull request #5159 from pjackson28/removelinksfromfooterheadings

Removed links from footer headings
WET theme: Aligned site menu with the v4.0 site menu
Merge pull request #5160 from pjackson28/updatesitemenu

WET theme: Aligned site menu with the v4.0 site menu
Tables: Removed redundant currency sorting support (already covered by formatted numbers sorting)
Merge pull request #5165 from pjackson28/removecurrencysortv31

Tables: Removed redundant currency sorting support (already covered by formatted numbers sorting)
Grids: Added medium support for nesting a span-3 in a span-4 (fixes #5174)
Merge pull request #5185 from pjackson28/addspan3nestinginspan4

Grids: Added medium support for nesting a span-3 in a span-4 (fixes #5174)
Pluralized the working example categories
Merge pull request #5194 from pjackson28/fixworkingexampletypesv31

Pluralized the working example categories
Removed unnecessary hidden text for table references to success criteria
Merge pull request #5243 from pjackson28/arbshorten

Removed unnecessary hidden text for table references to success criteria
Fixed sorting of formatted numbers in HTML tags
Merge pull request #5245 from pjackson28/fixsorting

Fixed sorting of formatted numbers in HTML tags
Form validation: Pluralized legend on checkbox example (fixes #5262)