Merge pull request #956 from BiteKollektiv/feature-hearts-and-comments

Feature hearts and comments
fix comment caching bug
show comment preview if there is just one comment
Fix "more comments" not showing more comments

When clicking the "more comments" link, no additional comments would
appear.

This was mainly due to a missing javascript_escape for render @comments
Fix single page library "more comments"
visited page history for after login redirection and feedbacks
Merge pull request #957 from BiteKollektiv/fix-more-comments-not-appearing

Fix "more comments" not showing more comments