Documentation: Moved progress bar and slider control documentation from wiki to HTML
Merge pull request #4316 from pjackson28/docsprogressslider

Documentation: Moved progress bar and slider control documentation from wiki to HTML
Docs: add Footnotes documentation
Merge pull request #4320 from patheard/docs-footnotes

Docs: add Footnotes documentation
Docs: add Language Selector documentation
Merge pull request #4322 from patheard/docs-langselect

Docs: add Language Selector documentation
Resolved merge conflicts