Merge pull request #135 from nidzix/master

LB-1551 : Fix CSS for bottom buttons
LB-1671
:
Check installation on win

Added close temporary file statement
Merge pull request #138 from ioanpocol/master

LB-1671
LB-1622: Added headers.

OPTIONS request needs content-type and accept headers
Merge pull request #141 from nistormihai/master

LB-1622: Added headers.
LB-1691
:
Add support for error on backend
Merge pull request #142 from ioanpocol/master

LB-1691
LB-1673

Styles update for SEO waiting messages