CSS improvement (make feedback tab obviously clickable).
Updated language file to match 1.x trunk.
Initial Sierra driver courtesy of Julia Bauder.
Added missing comment.
Resolving VUFIND-770 (string "0" is not translated).
Condition for ignoring rows of translation file was too general.
Thanks to Josef Moravec for the fix.
Use URL helper to generate query parameters instead of manual method.
Merge git://vufind.git.sourceforge.net/gitroot/vufind/vufind into bsbvf2