Updated EN po file for transifex.
Merge pull request #997 from emanuelschuetze/translation-en-1.5

Updated EN po file for transifex.
Fixed some javascript related problems
Merge pull request #1000 from ostcar/javascript

Fixed some javascript related problems
Mention django-jsonfield in the README.rst.
Fixed participant edit view
Update projector when the title of the default slide changes
Check used port, fix #985.
Merge pull request #1002 from ostcar/json-field

Mention django-jsonfield in the README.rst.
Merge pull request #1003 from ostcar/participant_update

Fixed participant edit view
Merge pull request #1004 from ostcar/update_projector_default_slide

Update projector when the title of the default slide changes
Merge pull request #1006 from normanjaeckel/CheckPort

Check used port, fix #985.
Merge pull request #1011 from DerPate/master

fix issue #933 and Windows like line ends (CRLF)