title: Special character issue in twig
body: <p>I have try following code for custom block. it is working fine when I does add content from admin. but, just issue for special character.</p>
  
  <p>admin\view\template\extension\module\theme_module.twig</p>
  
  <pre><code>&lt;div class="tab-content"&gt;
                      {% for language in languages %}
                      &lt;div id="tab8-language-{{ language.language_id }}" class="tab-pane"&gt;
                        &lt;div class="form-group"&gt;
                          &lt;div class="col-sm-10"&gt;
                          &lt;textarea name="custom_block[{{ language.language_id }}][description]" data-toggle="summernote" data-lang="{{ summernote }}" class="form-control" id="input-description8{{ language.language_id }}"&gt;{{ custom_block[language.language_id].description ? custom_block[language.language_id].description }}&lt;/textarea&gt;
                          &lt;/div&gt;
                        &lt;/div&gt;
                      &lt;/div&gt;
                      {% endfor %}
                    &lt;/div&gt;
  </code></pre>
  
  <p>admin\controller\extension\module\theme_module.php</p>
  
  <pre><code>if (isset($this-&gt;request-&gt;post['custom_block'])) {
              $data['custom_block'] = $this-&gt;request-&gt;post['custom_block'];
          } else {
              $data['custom_block'] = $this-&gt;config-&gt;get('custom_block');
  }
  </code></pre>
  
  <p>catalog\controller\common\header.php</p>
  
  <pre><code>$data['config_language_id'] = $this-&gt;config-&gt;get('config_language_id');    
  $data['custom_block'] = $this-&gt;config-&gt;get('custom_block');
  </code></pre>
  
  <p>catalog\view\theme\default\template\common\header.twig</p>
  
  <pre><code>{% set lang = config_language_id %}    
  {% if custom_block[lang]['description'] %}
         {{ custom_block[lang]['description'] | convert_encoding('UTF-8', 'HTML-ENTITIES') }}
      {% endif %}
  </code></pre>
  
  <p>when I does add content something like from admin: <strong>ľščťžýáíé</strong></p>
  
  <p>So, does Output: <strong>Ä¾Å¡ÄÅ¥Å¾Ã½Ã¡Ã­Ã©</strong></p>