/posts: word wrap long sources in sidebar.

* Don't truncate long sources in the sidebar on the post show page. Word
  wrap them instead.
* Word wrap long external links in general (mainly links in dtext).
* Turn sources into links on modqueue page.

app/javascript/src/styles/base/030_links.scss

@@ -25,3 +25,7 @@ a.active {
 a.wiki-link {
   margin-right: 0.3em;
 }
+
+a[rel*="external"] {
+  word-break: break-all;
+}

app/javascript/src/styles/specific/posts.scss

@@ -311,6 +311,10 @@ div#c-posts {
       font-weight: bold;
     }
 
+    #post-info-source {
+      word-break: break-all;
+    }
+
     .recommended-posts {
       margin-top: 1em;
     }