Back-button hides during install, fixing #11259
Updated System Info to reflect latest PHPMailer version from PR #11157
Fix some mistakes
Fixed a few actions for access policies
Fixed a few actions for access policies

* origin/pr/11270:
  Fixed a few actions for access policies
Updated System Info to reflect latest PHPMailer version from PR #11157

* origin/pr/11267:
  Updated System Info to reflect latest PHPMailer version from PR #11157
Hide Back-button during install

* origin/pr/11260:
  Back-button hides during install, fixing #11259
Updated russian lexicons

* origin/pr/11268:
  Fix some mistakes
tmp
tmp
tmp again
tmp again
First step to content type headers
Slight cleanup
Some more cleanup
Support custom http headers on content type creation
Update PHPMailer project link to GitHub
Update PHPMailer project link to GitHub

* origin/pr/11277:
  Update PHPMailer project link to GitHub
Support custom http headers on content type creation

* origin/pr/698:
  Support custom http headers on content type creation
  Some more cleanup
  Slight cleanup
  First step to content type headers
  tmp again
  tmp again
  tmp
  tmp