Revert "Renamed Japanese app name to "Barcode Scanner" in katakana"

This reverts commit 6dc6c7169c5ab32e28d1670251d9c39231021285.
Revert "Renamed Japanese app name to "Barcode Scanner""

This reverts commit 235e6144334638f2ba6595c7c25c7d6a68e06191.
Replaced words "Barcode Scanner" in Japanese help pages to "QR Code Scanner" in Japanese.