Add new fields to items: id_code, image, location; implement QR code generation and printing; update translations and UI

check_items.php

@@ -0,0 +1,7 @@
+<?php
+require 'vendor/autoload.php';
+require 'config.php';
+ = App\Database\Database::getInstance();
+ = ->query('SELECT id, name FROM items');
+ = ->fetchAll(PDO::FETCH_ASSOC);
+print_r();