Special characters in form element #title
Based on the version of drupal you are using, you can use one of functions below :

decode_entities($text) for Drupal 7


or

Html::decodeEntities($text) for Drupal 8


so in case of using drupal 7, Your code will looks like this:

$form['facets'][$current_property] = array(
  '#type' =&gt; 'select',
  '#title' =&gt; decode_entities($current_property),
  '#multiple' =&gt; TRUE,
  '#options' =&gt; $myoptions,
  '#default_value' =&gt; $widget-&gt;buildDefaultValue($element),
  '#attributes' =&gt; array('class' =&gt; array('facetapi-multiselect', 
    $form_state['facetapi_multiselect']['facet_class'])),
  '#post_render' =&gt; array('_facetapi_multiselect_modified_disable_options'),
);