Fix comment creation in single lib view

This was again an issue due to different markup.

fixes #40
Refactor comment i18n
Add margin to comment login notice
Align "delete comment" to the right
Add basic limitation of comment length

This is still missing a proper front-end fix.
It would be nice to split words that exceed the comment div.
Merge pull request #958 from BiteKollektiv/fix-comment-creation-on-single-lib-view

Fix comment creation in single lib view
Merge pull request #959 from BiteKollektiv/improve-comments-looks-stuff

Improve comments looks, add text length limitation