Barcode scanner improvements

- Added a message when no cameras are found.
- Release the camera when the popup is closed.

front/src/main.js

@@ -14,7 +14,7 @@ import fr from './locales/fr.json'
 import en from './locales/en.json'
 
 // configure i18n
-const i18n = createI18n({
+export const i18n = createI18n({
   locale: navigator.language,
   fallbackLocale: 'en',
   messages: { fr, en },