INTEG-282 When editing a webcontent, comments lines are divided into different activity comments

Fix description: Add only 1 comment when editing the node.
INTEG-270: Summary on content activity is pushed to new line after a character in bold/italic/underline

Fix description:
  - repair the function to get summary lines
Crowdin injection w7 (from 20140206 to 20140211)
Merge commit '751c51794a34c5f65c3c97c55be5f53cb297d8b8' into HEAD