Use mpdf's own QR code generation instead #465

This drops the dependency of an external service in favor of MPDF's own
barcode library. Sizes are configured somewhat differently there, so the
settin

Use mpdf's own QR code generation instead #465

This drops the dependency of an external service in favor of MPDF's own
barcode library. Sizes are configured somewhat differently there, so the
setting has been renamed.

Obsolete language strings are removed in a follow-up commit

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