Anchor link language can be set.
Attribute 'hreflang' can be edited for external links. For internal
links, the hreflang is set to the default language of the page.
Merge branch 'dev' of https://github.com/alohaeditor/Aloha-Editor into f-brz-r1p2-6-kb1211
Removes extra/flag-icons plugin
Fix IE compabilities.
Fix mozilla issues.