Merge pull request #617 from emanuelschuetze/master

1.4a1 release
Upgrade CKEditor from 4.1rc to 4.1.1
sortable and disableSelection are not always defined; lead to issue #615
Merge pull request #622 from emanuelschuetze/master

Updated CHANGELOG for 1.4
Move Version page out of config menu. Insert Link into the footer.
Merge pull request #624 from normanjaeckel/MoveVersionPage

Move Version page out of config menu. Insert Link into the footer.
Merge pull request #621 from CatoTH/Issue615

sortable and disableSelection are not always defined; lead to issue #615
Merge pull request #620 from CatoTH/ckeditor-4.1.1

Upgrade CKEditor from 4.1rc to 4.1.1
Fixed #580
Merge pull request #628 from ostcar/Issue580

Fixed #580
Fixed #604
Merge pull request #630 from ostcar/Issue604

Fixed #604
Fixed #629
Merge pull request #631 from ostcar/Issue629

Fixed #629
Translate group name in participant overview table.