HTML5 compliancy: use data prefix for custom attributes

static/styles/global.css

@@ -111,7 +111,7 @@ div.collage_image {
   width: 20%;
 }
 
-[data-toggle-target], [quote-jump] {
+[data-toggle-target], [data-quote-jump] {
   cursor: pointer;
 }
 
@@ -143,6 +143,10 @@ button, input[type=button], input[type=submit] {
   border: none;
 }
 
+abbr[title] {
+  text-decoration: none;
+}
+
 .line_new {
   color: green;
 }