Donate page strings to translate: CoinGate digital currencies

l10n
#1

Hello everyone,

For some of the donate pages with the "modern" design, like
https://www.libreoffice.org/donate/ we have added support for CoinGate,
which lets us accept many other types of digital currency. We've also
put Flattr into that box to simplify the donate page.

So if your local site has the newer donate page design with CoinGate,
and you'd like it to be localised, you can just reply with translations
to these three strings. (I've already done German, and can look at
feeding these into Pootle, but to speed things up I can just add the
translations directly). Thanks! Here are the strings:

DonatePage:
    BitcoinHeader: Digital currencies (eg Bitcoin) and Flattr
BitPay:
    CoinGate: Donate via CoinGate (Bitcoin, Litecoin, Ethereum, Dash and
others)
    CoinGateDesc: CoinGate is a payment gateway for blockchain payments,
supporting over 40 digital currencies. Simply enter an amount, choose a
currency, and your donation will be processed.