MH-10489, Switch audio encoder for videoeditor

As faac is not available on all systems, this patch will switch the
default audio encoder for the videoeditor to ffenc_aac which is avaiable
on all supported systems (tested Ubuntu 12.04, CentOS 6, CentOS 7 and
Fedora 20) as part of the gstreamer[0.10]-ffmpeg package which is
required anyway.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
MH-10503, Inconsistent Workflow Titles

The titles of some workflows are inconsistent. For example “Retract
media package” should be something like “Retract Media” (Uppercase,
prevent whole sentences). Additionally, there are some typos like
“Youtube” instead of “YouTube”. This commit fixes that.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
MH-10505, Preview Video for Captioning is Dependent on Videoeditor

The preview video was not generated if the video editor was not
selected. There were also JavaScript code remains of the former
algorithms to determine if a preview needs to be generated left. This
commit will fix that problem by always generating a preview video. It
will also fix MH-9353 as the special property is not necessary anymore.

The downside of this patch is that it might make the default workflow a
bit slower under certain circumstances, but in exchange it is much more
robust which I guess is what we want for this workflow (optimized for
robustness and features, not speed).

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
MH-10505, Fix Caption Preview Player

The caption preview player selected the preview video not only by its
flavour but also by a hardcoded mimetype value. Additionally things like
the advanced player link should not be displayed and the controls should
never be hidden.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
Merged in lkiesow/matterhorn/t/MH-10489-videoeditor-audio-encoder (pull request #315)

MH-10489, Switch audio encoder for videoeditor
Merged in lkiesow/matterhorn/t/MH-10503-inconsistent-workflow-titles (pull request #320)

MH-10503, Inconsistent Workflow Titles
Merged in lkiesow/matterhorn/t/MH-10505-preview-for-caption-upload (pull request #321)

MH-10505, Preview Video for Captioning is Dependent on Videoeditor