Use a custom sluggable listener to convert the german "Umlaute" correctly

gistfile1.diff

Index: app/config/config.yml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- app/config/config.yml  (revision d38cd17)
+++ app/config/config.yml	(revision 8f4f85a5ccd3e17b6bbe235fed1b5cff44c07d65)
@@ -68,6 +68,8 @@
     default:
       timestampable: true
       sluggable: true
+  class:
+    sluggable: Systemli\MemorialBundle\Listener\SluggableListener
 
 sonata_block:
   default_contexts: [cms]
\ No newline at end of file
Index: src/Systemli/MemorialBundle/Listener/SluggableListener.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/Systemli/MemorialBundle/Listener/SluggableListener.php	(revision 8f4f85a5ccd3e17b6bbe235fed1b5cff44c07d65)
+++ src/Systemli/MemorialBundle/Listener/SluggableListener.php	(revision 8f4f85a5ccd3e17b6bbe235fed1b5cff44c07d65)
@@ -0,0 +1,13 @@
+<?php
+
+namespace Systemli\MemorialBundle\Listener;
+
+use Gedmo\Sluggable\SluggableListener as BaseSluggableListener;
+
+class SluggableListener extends BaseSluggableListener
+{
+    public function __construct()
+    {
+        $this->setTransliterator(array('\Systemli\MemorialBundle\Util\Transliterator', 'transliterate'));
+    }
+}
\ No newline at end of file
Index: src/Systemli/MemorialBundle/Util/Transliterator.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/Systemli/MemorialBundle/Util/Transliterator.php	(revision 8f4f85a5ccd3e17b6bbe235fed1b5cff44c07d65)
+++ src/Systemli/MemorialBundle/Util/Transliterator.php	(revision 8f4f85a5ccd3e17b6bbe235fed1b5cff44c07d65)
@@ -0,0 +1,16 @@
+<?php
+
+namespace Systemli\MemorialBundle\Util;
+
+use Gedmo\Sluggable\Util\Urlizer;
+
+class Transliterator
+{
+    public static function transliterate($text, $separator = '-')
+    {
+        $text = Urlizer::unaccent($text);
+        return Urlizer::urlize($text, $separator);
+    }
+
+
+}
\ No newline at end of file