StopPropagation of link in message

It prevents opening a conversation view by the click of a link.
In the conversation view, it was unnecessary.
A new-line is displayed as it is.
Merge pull request #9 from haushinka2dx/stop-propagation-link

Stop propagation link in message
Merge branch 'multicolumn' into starter
Merge pull request #10 from haushinka2dx/word-break

Word break
Merge branch 'multicolumn' into starter