Add styles for sign-off and verification statuses

Two Fontawesome icons needed to have color added.

source/mahara/static/mahara.css_t

@@ -402,6 +402,13 @@ input[type="submit"]:before {
   color: #f04f50;
 }
 
+.sign-off_yes {
+  color: #449d44;
+}
+.sign-off_no {
+  color: #f04f50;
+}
+
 .link-blocktype {
   font-size: 0.9178em;
   margin: 10px 0;