Fixes #770: Error message on (un)subscribe if an activity does not exist
add simple tag cloud to the members index page
Merge pull request #783 from mknittig/bug-770

Fixes #770: Error message on (un)subscribe if an activity does not exist
Merge pull request #784 from heisee/master

add simple tag cloud to the members index page
remove console.log, comments and split only on commas
Merge pull request #786 from heisee/master

[tagcloud] remove console.log, comments and split only on commas
Removed information for SoCraTes conference.
"Leave Group" button is now white instead of blue.