Use double quotes when embeding translations in JS

Translations commonly include single quotes, which closes
the JavaScript string unexpectedly. Closes #5055
Port Getting Started page to Bootstrap
Merge pull request #5057 from blase/feature/4466-port-getting-started-page-to-bootstrap

Port Getting Started page to Bootstrap
Remove stylesheet tag from mobile sign_up template
Remove text shadow from the button
Merge pull request #5061 from blase/feature/4466-port-getting-started-page-to-bootstrap

Remove text shadow from the button
Publish salmon endpoint URL in Webfinger XRD

Specification in Panzer draft for Salmon, paragraph 3.3 mentions:
   "The 'salmon' link relation may specify a Salmon endpoint used to notify
    a resource, typically a user account, about external mentions of that
    resource. For a user account, the salmon mention link SHOULD appear in
    the Webfinger [Webfinger] XRD document for the user account."

Source:
http://salmon-protocol.googlecode.com/svn/trunk/draft-panzer-salmon-00.html#SMLR
Merge pull request #5062 from mmn/develop

Publish salmon endpoint URL in Webfinger XRD
Add changelog for mobile sign-in fix [ci skip]