Add GroupHelper to group activities more logical
Fix tests again
Do not group items in RSS feed
Fix language
Add tests for grouped activities
Try to satisfy scrutinizer
Remove grouping logic form template file as it does not apply anymore
Remove more grouping logic from the template

Fix #1
Retab template
Remove unused OC_L10N object
Remove leading slash and add tipsy
Prepare more information for "%n more"
Only add title when path is trimmed and adjust tests
Remove title attribute from message
Use tooltip for the list of trimmed files
Move link to activity subject
Fix tests
Use a new index for the params array, so scrutinizer does not complain
Move file parameter preparation into new method, to reduce complexity
Don't use global links anymore (we link the file names instead)