* Add POReceiveBarcodeHandler to support barcode/po-receive/ endpoint
* Remove german translation
* Add api version checks
* Add getOverlayText method to barcode handler
* Bump required API version to 139
* Update barcode.dart
The "quantity" field is not an integer, and can cause the app to crash if not handled correctly
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Co-authored-by: Oliver <oliver.henry.walters@gmail.com>