Remove coinbase-dependant transactions during reorg.

This still leaves transactions in mempool that are potentially
invalid if the maturity period has been reorged out of, but at
least they're not missing inputs entirely.
Remove txn which are invalidated by coinbase maturity during reorg
Make CTxMemPool::check more thourough by using CheckInputs
Make CTxMemPool::remove more effecient by avoiding recursion
RPC-test based on invalidateblock for mempool coinbase spends
qt: translations pull from transifex
Merge pull request #5267

34318d7 RPC-test based on invalidateblock for mempool coinbase spends (Gavin Andresen)
7fd6219 Make CTxMemPool::remove more effecient by avoiding recursion (Matt Corallo)
b7b4318 Make CTxMemPool::check more thourough by using CheckInputs (Matt Corallo)
723d12c Remove txn which are invalidated by coinbase maturity during reorg (Matt Corallo)
868d041 Remove coinbase-dependant transactions during reorg. (Matt Corallo)
depends: Gitian 0.10 fixes

Github-Pull: #5465
Rebased-From: 422f873ef3d62f7dff9c00dc0f221912ce28f130 d546191dc28fac0e365c8f2aba47ac69a8920d6c d7db4b6317fd9c79bd6fd7c7455d7186b306411f e27d7cb24835c6ce16c12eb758c2d75806103c4a
signrawtransaction: validate private key.

Github-Pull: #5461
Rebased-From: aa768f1848b00e0fd615016598d3fb1f1da240ed
Merge remote-tracking branch 'bitcoin/0.10' into 0.10