Refresh if maintenance mode is over

Using status.php for this.
I modified status.php to also show, whether we're in maintenance.

Checks every 20 seconds if maintenance is over, if yes: reload.
This fixes the double scrollbars issue
Add custom hex2bin implementation for 5.3

Fixes https://github.com/owncloud/core/issues/11004
use intl's native normalizer_normalize() in case the module is available
Add X-UA-Compatible to all templates

Replaces https://github.com/owncloud/core/pull/10850
Merge pull request #3937 from owncloud/refresh_if_maintenance_is_over

Refresh if maintenance mode is over
Merge pull request #11007 from owncloud/replaces-10850

Add X-UA-Compatible to all templates
fix notification visibility, fix #11016
Merge pull request #11006 from owncloud/addCustomHex2BinImplementationBecauseSupporting53IsSomethingReallyReallyCoolAndWeAreObviouslySomeOfTheCoolGuys

Add custom hex2bin implementation for 5.3
Do not double decode values

Fixes https://github.com/owncloud/core/issues/11012
improve style of checkmark icon, less bold, fitting ownCloud style
fix size of toggle icon, make container square
fix svg of calendar filetype icon
fix folder icon alignment, fix #10866
Merge pull request #11018 from owncloud/fix-notification-layer

fix notification visibility, fix #11016
fix nojavascript message alignment
Merge pull request #11022 from owncloud/icons-fix

Fix icons
Merge pull request #11024 from owncloud/fix-nojavascript

fix nojavascript message alignment
[tx-robot] updated from transifex
content size checks are not valid for LOCK