Display product name and image only if line has it
Template improvements

* Added meta description
* Implemented meta description on common pages
Code cleanup: Use scripts instead of script_tags

script_tags is for introducing new javascript file
dependencies before script tags which use then appear
in the code. scripts block is a better choice to have
javascript code which works with the DOM
Checkout page style improvements
Integrate will google analytics

* step 3 is reserved for delivery methods, which does not have a
  template yet
Handle case where templates are displayed
Import with context
Instead of importing, manually build gc product
Add JSON+LD structured data to product page
Improve Opengraph content
Add block with Website and Search option microdata
Move lightbox css and js link tags to product template #5970
Added test for CSS validity.
Modified requirements.txt to add cssutils.
Fixed style.css syntax error; css test now passes.
Disable pay button on first click to prevent multiple submissions #5858
Encapsulate ga events on separate block
Display breadcrumb on all templates with microdata
Render the ga code in sale confirmation
Added link of product from checkout/cart summary #5884
Do not translate sale comments #6022