Fix: Hide system directories (.blobs, .trash, .dedup_temp) from all users

- Added directory name filtering in folder_fs_repository.rs
- Filters out directories starting with '.' in list_folders, list_folders_paginated, and count_directory_items
- Matches existing file listing behavior
- Also added Italian language to popular languages list

Fixes #87

static/js/languageSelector.js

@@ -16,7 +16,8 @@ function getAvailableLanguages() {
         { code: 'fa', name: 'فارسی', flag: '🇮🇷' },
         { code: 'fr', name: 'Français', flag: '🇫🇷' },
         { code: 'de', name: 'Deutsch', flag: '🇩🇪' },
-        { code: 'pt', name: 'Português', flag: '🇧🇷' }
+        { code: 'pt', name: 'Português', flag: '🇧🇷' },
+        { code: 'it', name: 'Italiano', flag: '🇮🇹' }
     ];
 }