CE-315
Hiding "All Ages" option in languages other than EN.
Removed "error_reporting"
VE-353: set up base tracking implementation (wraps MW tracking).
used wikia.fluidlayout module to get all the sizes
added gerRightRailWidth to wikia.fluidlayout module
refactored PageControls.js so it uses wikia.fluidlayout module and passes isWidePage to wikia.preview module
added a getter method which returns a different previewTypes object depending on the fact if "page is wide"
DAR-2402: ES, FR and PL translations
small refactoring and adjustments
jsling: removed redudant initialPreviewWidth variable
jsling: removed unused variables
jslint: added semicolon; less "var" in scalePreview() method
extracted adding edit summary to seperate method and fix it for fluid layout
added new mixin in responsive-mainpage-tag.scss so the rules for media-query can be reused in edit preview; fixed edit preview for mainpages
small refactoring and explanation added
fixed regression making article preview modal smaller after adding edit summary
DAR-2402: Added next translations
DAR-2506 fixed previewing main pages of different widths
DAR-2506 change in the logic of previewing main pages
VE-471: first pass refactoring (WIP)