Added ability to use an object in MODx.add
Fixed clear filter in system settings. Fixes #11379
Fix: JSON Content Type has file extension .js
Restore missing styles for .x-grid-link
Restore missing styles for .x-grid-link

* origin/pr/11384:
  Restore missing styles for .x-grid-link
Changed extension of JSON content type from .js to .json

* origin/pr/11380:
  Fix: JSON Content Type has file extension .js
- NL top menu lexcions for 2.3.x
- NL about lexicons for 2.3.x
- added email field placeholder lexcion to about page
- fixed facebook icon on about page
- Advanced option to disable CSS/JS compression during setup, overrules Suhosin check
- fixed capitalization of _checkNoCompress() method
Updated NL lexicons. Added lexicon entry for email placeholder to about page.

* origin/pr/11387:
  - NL top menu lexcions for 2.3.x - NL about lexicons for 2.3.x - added email field placeholder lexcion to about page - fixed facebook icon on about page
Option to disable CSS/JS compression during setup

* origin/pr/11388:
  - fixed capitalization of _checkNoCompress() method
  - Advanced option to disable CSS/JS compression during setup, overrules Suhosin check
Added ability to use an object in MODx.add

* origin/pr/11376:
  Added ability to use an object in MODx.add