Bug 976966 - Make AM/PM localizable in system
bug 976960

* fire cardviewclosed with new stack position but wait for 'appopen' from AppWindowManager to fire before actually hiding the cardswitcher.
* added unit test to ensure that we don't regress this fix.

r=etienne
Bug 968478 - Put calendar behind scrollable background
Bug 976951 - Customize network indicator by SIM displayed in quick settings
Merge pull request #16729 from nullaus/bug976960

bug 976960
Merge pull request #16664 from flodolo/bug976966_lockscreentime

Bug 976966 - [System] Make AM/PM localizable
Merge pull request #16751 from changm/bug968478

Bug 968478 - Put calendar behind scrollable background. r=millermedeiros
Merge pull request #16739 from mcjimenez/bug976951_v2

Bug 976951 - Customize network indicator by SIM displayed in quick settings, r=21+kaze