Infrastructure

Cloned from: https://bugs.documentfoundation.org/show_bug.cgi?id=56942

How to reproduce:

1. Open the donation page (e.g. http://donate.libreoffice.org/)
2. Select "Or enter a custom amount and currency
(only those marked with * are also available via PayPal)"
3. Choose currency "JPY" (Japanese Yen).
4. Re-select "Select one of the default values" and choose one of the value
(e.g. 50 USD).
5. Click "Donate via Credit Card".

Excepted Result:

- Move to donation process page with "50 USD."

Current Result:

- Move to donation process page, but with "50 JPY."

NOTE: http://donate.libreoffice.org/ja have same problem.