Merge pull request #8690 from pivanov/bug-845073

Bug 845073 - Delete Email screen update
Bug 857247 - Fix styles for add/edit event page.
Merge pull request #8948 from KevinGrandon/bug_857247_calendar_css_fixes

Bug 857247 - Fix styles for add/edit event page r=pivanov
Merge pull request #8898 from pivanov/bug-845113

Bug 845113 - Calendar Account Selection Screen Update
Bug 845121 - Calendar - Delete account screen layout update