Fix image update in edit, QR code generation and translations

public/js/app.js

@@ -323,7 +323,7 @@ document.addEventListener('DOMContentLoaded', function() {
         }
 
         fetch('/api/items/' + id, {
-            method: 'PUT',
+            method: 'POST',
             body: formData
         })
         .then(response => response.json())