Issue #2479377 by dpi, edurenye, tstoeckler, andypost, mgifford, RajabNatshah, mglaman, jespermb, hitfactory, meramo, lluvigne, amateescu: content_translation_page_attachments() should check for a canonical link before generating a URL to it

Issue #2553553 by burkeker, alvar0hurtad0, meramo: Remove references to system.module.css and system.theme.css in core

Issue #2473215 by smccabe, joshi.rohit100, googletorp, drubb, sumitmadan, m4olivei, jmolivas, darol100, meramo: Wrong text if no content types are available

Issue #2349503 by targoo, guntervs, tadityar, meramo, piyuesh23, janne.valtakari: Incorrect documentation about dates in node template