- 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
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