Set the payment fee for pending and paid docdata payments.
Merge pull request #742 from benkonrath/bug-fixes-improvements

Deal with lang-country codes (e.g. 'en-us') in money l10n.
Merge pull request #743 from benkonrath/cowry-docdata-legacy-payment-fee

Set the payment fee for pending and paid docdata payments.
Include language in redirects
Fix tests for new redirects
Merge pull request #744 from gannetson/gone-on-safari

Include language in redirects
Ensure Decimal addition for payment fee.
Merge pull request #745 from benkonrath/cowry-docdata-legacy-payment-fee

Ensure Decimal addition for payment fee.
Use en as default language for donation representation.