Merge pull request #645 from craigcook/master

Bug 833468 - trailing slash for MWC badge URL
Bug 844860 - remove en-US in link to MDN to allow locale detection
Bug 844885 - Allow locale detection in MWC badge on mozilla.org pages
Merge pull request #647 from pascalchevrel/Bug844885-MWCBadgeLink-l10n

Bug 844885 - Allow locale detection in MWC badge on mozilla.org pages
Merge pull request #646 from pascalchevrel/Bug844860-linkupdate-l10n

Bug 844860 - remove en-US in link to MDN to allow locale detection
Add script to open github compare view for any env.
Bug 844885: Allow locale detection in MCW badge on mozilla.org pages.

Include base.html in the fix from
14c0e9a227b895817bade96834ec0449edc753b9
Merge pull request #642 from pmclanahan/add-version-compare-script

Add script to open github compare view for any env.