Update Dojo Toolkit
Update Jetty Maven plugin
Add missing i18n string
Fix error handling and validation for session updates
Update QR icon
Merge branch '1.1'
Fix session creation proposal dialog

The dialog is now shown as intended if no sessions are available.
Additionally the related menu item is checked when switching modes.
Improve wording for session creation proposal
Release version 1.1.1
Start next patch release cycle
Merge branch '1.1'