Some characters in titles appear encoded (#10902)

fixes #10663

`e('html_attr')` is not needed as it is a plain translation anyway

plugins/API/templates/listAllAPI.twig

@@ -10,7 +10,7 @@
 {% block content %}
 
 <div class="api-list">
-    <div piwik-content-block content-title="{{ title|e('html_attr') }}" rate="true">
+    <div piwik-content-block content-title="{{ title }}" rate="true">
         <p>{{ 'API_PluginDescription'|translate }}</p>
 
         <p>
@@ -27,4 +27,4 @@
     {{ list_api_methods_with_links|raw }}
     <br/>
 </div>
-{% endblock %}
+{% endblock %}
\ No newline at end of file