Updated Swedish translation
Add initial installed tests
Install tests using --enable-installed-tests switch
Update installed tests to work with latest GtkFileChooser

The location entry is shown differently now and apparently there is
also a slightly longer timeout needed until one can press Enter.

https://bugzilla.gnome.org/show_bug.cgi?id=727989
Prepare for release 3.13.1
Post-release version bump
Finnish help translation