It seems the strings in `qt/bitcoin.cpp` are not translated.

E.g. `qt/bitcoin-qt -lang=cz -datadir=/tmp/a2` gives me a warning in English that the datadir does not exist.

QT_TRANSLATE_NOOP("bitcoin-core", ""
"Query for peer addresses via DNS lookup, if low on addresses (default: 1 "
"unless -connect/-noconnect)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Randomize credentials for every proxy connection. This enables Tor stream "
"isolation (default: %u)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Reduce storage requirements by pruning (deleting) old blocks. This mode is "
"incompatible with -txindex and -rescan. Warning: Reverting this setting "
"requires re-downloading the entire blockchain. (default: 0 = disable pruning "
"blocks, >%u = target size in MiB to use for block files)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Rescans are not possible in pruned mode. You will need to use -reindex which "
"will download the whole blockchain again."),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Set the number of script verification threads (%u to %d, 0 = auto, <0 = "
"leave that many cores free, default: %d)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Sets the serialization of raw transaction or block hex returned in non-"
"verbose mode, non-segwit(0) or segwit(1) (default: %d)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"Support filtering of blocks and transaction with bloom filters (default: %u)"),
QT_TRANSLATE_NOOP("bitcoin-core", ""
"The block database contains a block which appears to be from the future. "
"This may be due to your computer's date and time being set incorrectly. Only "
"rebuild the block database if you are sure that your computer's date and "
"time are correct"),
QT_TRANSLATE_NOOP("bitcoin-core", ""