Use the certificateChain() in the SSL error dialog

This includes the self-signed certificate anyway, and the previous
behavior led to funny side-effects.
[tx-robot] updated from transifex
Try to avoid crash on Mac OS during setup

... by moving setupFavLink to a place only called
if the folder to be referenced exists for sure.
Add plugin for screenreader support
[tx-robot] updated from transifex
Merge git://github.com/owncloud/mirall
Check for service availability