Implement "Add contact" icon

skins/elastic/styles/icons.less

@@ -7,6 +7,7 @@ a.button.icon:before,
 .folderlist li a:before,
 .listing.iconized tr td:before,
 .listing.iconized li a:before,
+a.rcmaddcontact:before,
 #taskmenu a:before {
 	font-size: 1.25em;
 	/*display: inline-block;*/
@@ -295,3 +296,11 @@ a.button.icon.back-list-button:before {
 a.button.icon > span.inner {
 	display: none;
 }
+
+a.rcmaddcontact:before {
+	content: @fa-var-user-plus;
+	display: inline;
+	float: none;
+	margin-left: 5px;
+	font-size: inherit;
+}

skins/elastic/templates/message.html

@@ -12,7 +12,7 @@
 		</span>
 	</h2>
 	<div class="message-headers">
-		<roundcube:object name="messageHeaders" class="headers-table" addicon="/images/addcontact.png" exclude="subject" max="20" />
+		<roundcube:object name="messageHeaders" class="headers-table" addicon="virtual" exclude="subject" max="20" />
 	</div>
 	<roundcube:object name="messageFullHeaders" id="full-headers" />
 	<div id="contactphoto"><roundcube:object name="contactphoto" /></div>