ProductBarcode: various fix requested by Tonya

- fix many missing translations
- properly reset QR scanner when reopening
- add error message on BarcodeModal when no item is found
- fix icon size in item CreateModal
- remove useless closeDialog

frontend/components/App/ScannerModal.vue

@@ -137,6 +137,7 @@
 
   watch(open, async isOpen => {
     if (isOpen) {
+      detectedBarcode.value = "";
       await startScanner();
     } else {
       stopScanner();