Merge pull request #3441 from mozilla/issue_3430_feura_sans

Use Feura Sans font for the mobile layout.
Merge pull request #3444 from mozilla/issue_3410_email_picker_icon

Issue 3410 styling updates
Fix TOS/PP iframe scrolling.

Sidestep the scrolling issue entirely. Only show the TOS/PP agreement in an embedded iframe IFF the browsing enviornment does not support window.open

fixes #3442
Merge branch 'issue_3442_tos_pp_scroll_mobile' into all-together-now