Bugfixes/Ajax features/Cleanup

Fixes:
- usage of innerText is undefined in Firefox and results in a title "undefined"
- after an ajax operation the pagetitle was accidental changed to "feedtitle (counter)"  at the feed items view 
- feed-items page didn't reload after all articles are removed via ajax from the view

Features:
- reload the page if all articles are removed from the current view but another page with articles exists

Cleanup: