Removes HTML tags from writeSignoffCommit setting description in web ui

Author: Robert Führicht

src/main/java/com/gitblit/wicket/GitBlitWebApp.properties

@@ -559,7 +559,7 @@ gb.requireApprovalDescription = patchsets must be approved before merge button i
 gb.requireScore = require score
 gb.requireScoreDescription = patchsets must be rated this high before merge button is enabled
 gb.writeSignoffCommit = write signoff commit
-gb.writeSignoffCommitDescription = reviewed patchsets will have lines of the form 'value: reviewer name <reviewer email>' added to their merge commit.\nE.g. if set to <em>Signed-off-by</em>: 'Signed-off-by: reviewer <reviewer@example.com>'. Please see the <a target="_new" href="https://git.wiki.kernel.org/index.php/CommitMessageConventions">conventions</a> on the meaning of possible values for this.
+gb.writeSignoffCommitDescription = reviewed patchsets will have lines of the form 'value: reviewer name <reviewer email>' added to their merge commit.\nE.g. if set to 'Signed-off-by': 'Signed-off-by: reviewer <reviewer@example.com>'.
 gb.topic = topic
 gb.proposalTickets = proposed changes
 gb.bugTickets = bugs