Merge #19231: gui: add missing translation.h include to fix build

948f113 gui: add missing translation.h include to fix build (fanquake)

Pull request description:

  After #19176, building the gui on Bionic is failing with:

  ```bash
    CXX      qt/qt_libbitcoinqt_a-guiutil.o
  qt/bitcoin.cpp: In function 'int GuiMain(int, char**)':
  qt/bitcoin.cpp:460:35: error: 'Untranslated' was not declared in this scope
             node->initError(strprintf(Untranslated("Error parsing command line arguments: %s\n"), error));
  ```

  The merge commit also failed to compile with the same error:
  https://travis-ci.org/github/bitcoin/bitcoin/jobs/696627543

ACKs for top commit:
  hebasto:
    ACK 948f113, tested on Linux Mint 19.3 (x86_64): it fixes compiling error with the `--disable-wallet` configure option.

Tree-SHA512: db0197b110b3a7d05af2ceb29fbe9eeb6521d28f53b6267aa6d07a975886adb5c6485af79506ab6c66ed101e32292feeaff3707cdbc11432e5b97400953d5631

Author: fanquake

src/qt/bitcoin.cpp

@@ -33,6 +33,7 @@
 #include <ui_interface.h>
 #include <uint256.h>
 #include <util/system.h>
+#include <util/translation.h>
 #include <util/threadnames.h>
 #include <validation.h>