Fix #3302 smiley are not render into last activity module and email

protected/humhub/docs/CHANGELOG.md

@@ -16,6 +16,7 @@ HumHub Change Log
 - Enh: Allow urls in array form in homeUrl configuration
 - Fix: Javascript `humhub.modules.util.object.extend` not working on older Safari version
 - Enh: Enable usage of `humhub\modules\content\widgets\PermaLink` outside of `humhub.modules.content.Content` components.
+- Fix #3302 smiley are not render into last activity module and email 
 
 1.3.2  (September 4, 2018)
 --------------------------

protected/humhub/modules/content/widgets/richtext/ProsemirrorRichText.php

@@ -8,6 +8,7 @@
 
 namespace humhub\modules\content\widgets\richtext;
 
+use humhub\libs\EmojiMap;
 use humhub\libs\Helpers;
 use humhub\libs\Markdown;
 use humhub\libs\ParameterEvent;
@@ -182,9 +183,21 @@ class ProsemirrorRichText extends AbstractRichText
     protected function renderMinimal() {
         $parser = new Markdown();
         $result = strip_tags($parser->parse($this->text));
+        $result = $this->toUTF8Emoji($result);
         return ($this->maxLength > 0) ? Helpers::truncateText($result, $this->maxLength) : $result;
     }
 
+    protected function toUTF8Emoji($text)
+    {
+        return preg_replace_callback('/:(([A-Za-z0-9])+):/', function($match) {
+            if(isset($match[1])) {
+                $result = EmojiMap::MAP[$match[1]];
+            }
+
+            return empty($result) ? $match[0] : $result;
+        }, $text);
+    }
+
     /**
      * @return string html extension holding the actual oembed dom nodes which will be embedded into the rich text
      */