Use --force-yes for node-webkit

It's not signed yet.
Workaround for missing libgettextlib.so on Trusty
Avoid NFS bashing

This apparently caused bunch of extra writes/reads
Avoid useless use of cat :)

@juhaerk!
Add german translation files
translated to german

This commit is a combination of squashed commits from pull request by
@basilstotz. Closes #37

Commits:

added german translation

Update feedback.json

Update logout.json

Update menuitem.json

translated to german

Update search.json

translated to german

Update feedback.json

Update config.json

added german translation

added german translation

added german translation

added german translation

added german translation

added german translation

added german translation

added missing colons
If --webkiosk command line parameter is set, set the WM_WEBKIOSK_MODE
environment variable to true.
Check the WM_WEBKIOSK_MODE environment variable and do not
show poweroff/reboot dialogs when that is set.
Merge branch 'webkiosk'

Add some --webkiosk mode support to webmenu.
Merge remote-tracking branch 'origin/master' into trusty