CE-315
Hiding "All Ages" option in languages other than EN.
Removed "error_reporting"
VE-353: set up base tracking implementation (wraps MW tracking).
Unit tests added for wfReplaceImageServer
ThumbnailVideo: rewrite URLs using $wgWikiaVideoImageHost
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