Refactor out translation.h

This is a prerequisite for introducing bilingual error messages.
Note: #includes are arranged by clang-format-diff.py script.

src/wallet/wallet.cpp

@@ -25,6 +25,7 @@
 #include <util/fees.h>
 #include <util/moneystr.h>
 #include <util/rbf.h>
+#include <util/translation.h>
 #include <util/validation.h>
 #include <validation.h>
 #include <wallet/coincontrol.h>