Remove blockquotes from post previews

Closes flarum/core#144

js/forum/src/components/PostPreview.js

@@ -1,7 +1,6 @@
 import Component from 'flarum/Component';
 import avatar from 'flarum/helpers/avatar';
 import username from 'flarum/helpers/username';
-import humanTime from 'flarum/helpers/humanTime';
 import highlight from 'flarum/helpers/highlight';
 
 /**
@@ -22,8 +21,7 @@ export default class PostPreview extends Component {
       <a className="PostPreview" href={app.route.post(post)} config={m.route} onclick={this.props.onclick}>
         <span className="PostPreview-content">
           {avatar(user)}
-          {username(user)}
-          {humanTime(post.time())}
+          {username(user)}{' '}
           <span className="PostPreview-excerpt">{excerpt}</span>
         </span>
       </a>

js/lib/utils/string.js

@@ -34,9 +34,15 @@ export function slug(string) {
  * @return {String}
  */
 export function getPlainContent(string) {
-  return $('<div/>').html(string.replace(/(<\/p>|<br>)/g, '$1 ')).text();
+  const dom = $('<div/>').html(string.replace(/(<\/p>|<br>)/g, '$1 &nbsp;'));
+
+  dom.find(getPlainContent.removeSelectors.join(',')).remove();
+
+  return dom.text();
 }
 
+getPlainContent.removeSelectors = ['blockquote'];
+
 /**
  * Make a string's first character uppercase.
  *