Updates, improvements and fixes after site migration (#6)

New features

• User Profile pages now list achievements and achievement progress of that user.

• User Profile pages now have a direct link to send Private Message to that user.

• User Profile pages now indicate if the user is Online or Offline (last seen within 15 minutes).

Improvements

• Further improved the browser back button behaviour on legacy UI pages.
  
  
• Improved the page loading of legacy UI pages to improve page loading times even further.
  
  
• Improved the layout loading of legacy UI pages for small laptop displays, mainly MacBook.
  
  
• Reactivated Google Analytics to collect usage statistics (was temporarily disabled during the site migration).

Fixes

• Unread messages notification balloon in Airline Status Bar sometimes overlapped the airline name,
  
  
• "Cancel" button on "Delete all messages" page confirmation dialog did not work.
  
  
• Route Editor's "copy to next day" function reloaded the editor after route was created.
  
  
• Forum's "Total time spent Online" didn't work with the new backend / user data.

• Fixed some e-mail deliverability issues for game's notifications.

• Corrected an error in newsletter's user country segmentation.
  
  
• Old UIs modal dialog windows did not position correctly on some mobile devices.
  

• Made Settings page's Airline Description text area to be only vertically resizable to avoid layout shifts.

• User profile page showed "last seen" 01-01-1970 if user had never logged in.
  
  
• Minor layout fixes to display of alliance logo and livery on legacy UI pages.