fix: content directory names other than 'content' caused issues

app/modules/filesinfolders.php

                 
                 $f3->config($form_config_file);
                 $fields = $f3->get('fields');
+                
                 foreach ($fields as $k => $v) {
                     if ($v['type'] == 'custom') {
                         $fields[$k]['template'] = sprintf(
                             "%s%s",
-                            substr($this->folder,8), //assumens content folder is content
+                            substr($this->folder,strlen($f3->get('CONTENT_BASE'))), //assumens content folder is content
                             $v['template']
                         );
                     }

index.php

 $f3->set('DEBUG', 0);
 $f3->set('CACHE', FALSE);
 $f3->set('AUTOLOAD', ROOT.'app/');
-$f3->set('UI', implode(';', array(
-    ROOT.'app/views/',
-    ROOT.'content/' // content folders can contain .html templates
-)));
+
 
 if (!is_dir($f3->get('TEMP'))) {
     mkdir($f3->get('TEMP'));
   $content_dir=$f3->get('content.'.$f3->get('default_lang'));
 }
 $f3->set('CONTENT', $content_dir);
+$f3->set('CONTENT_BASE', array_shift(explode("/",$f3->get('CONTENT'))).'/');
 
+$f3->set('UI', implode(';', array(
+    ROOT.'app/views/',
+    ROOT.$f3->get('CONTENT_BASE') // content folders can contain .html templates
+)));
 
 function menu_recursion($m,$root="") {
     $f3 = \Base::instance();
 
 // HTML preloading of images
 // this could also find some better place
+
 $f3->mset(array(
-        'cached_images' => array(\Controller\Page::check_folder_for_backgroundimage('content/'))
+        'cached_images' => array(\Controller\Page::check_folder_for_backgroundimage($f3->get('CONTENT_BASE'))
+            )
     ));