translations update 2013-03-19 (bitcoinstrings.cpp / bitcoin_en.ts)
blockchain -> block chain (used everywhere else)
fix "send coins" via context menu in address book

- the send coins context menu entry was not working anymore, because
  a non current version of #2220 was merged onto current master
- also removes some unneeded spaces and adds a comment to
  WalletModel::getNumTransactions()
Bitcoin-Qt: fix debug window

- fix debug window, by re-adding rpcConsole->setClientModel(clientModel);
  in BitcoinGUI::setClientModel(), which was removed by #2220
Merge pull request #2440 from Diapolo/Qt_fix_debug_window

Bitcoin-Qt: fix debug window
Merge pull request #2437 from Diapolo/Qt_fixes

fix "send coins" via context menu in address book
Merge pull request #2387 from Diapolo/translations

translations update 2013-03-19 (bitcoinstrings.cpp / bitcoin_en.ts)