Wrap text that overflows the description field.

app/assets/stylesheets/generic/typography.scss

@@ -89,6 +89,8 @@ a:focus {
 .wiki {
   @include md-typography;
 
+  word-wrap: break-word;
+
   /* Link to current header. */
   h1, h2, h3, h4, h5, h6 {
     position: relative;