Replace all latin1 references to bitcoin/bitkoin with dogecoin/dogekoin

This replaces all references to bitcoin/bitkoin with dogecoin/dogekoin/dogecoin core as appropriate, across all translations. Example addresses in QT locale files have also been replaced with example Dogecoin address taken from 1.6 client.

References to "dogecoin.pid" or "bitcoin.pid" have been standardised on "dogecoind.pid".