Implement an insert tag.

module/config/config.php

@@ -61,6 +61,10 @@ $GLOBALS['TL_CTE']['includes']['leaflet'] = 'Netzmacht\Contao\Leaflet\Frontend\M
  */
 $GLOBALS['FE_MOD']['includes']['leaflet'] = 'Netzmacht\Contao\Leaflet\Frontend\MapModule';
 
+/*
+ * Hooks
+ */
+$GLOBALS['TL_HOOKS']['replaceInsertTags'][] = array('Netzmacht\Contao\Leaflet\Frontend\Hooks', 'replaceInsertTags');
 
 /*
  * Models.