qt: fix unicode character display on osx when building with 10.7 sdk

src/qt/bitcoin.cpp

@@ -489,6 +489,9 @@ int main(int argc, char *argv[])
 
     Q_INIT_RESOURCE(bitcoin);
     Q_INIT_RESOURCE(bitcoin_locale);
+
+    GUIUtil::SubstituteFonts();
+
     BitcoinApplication app(argc, argv);
 #if QT_VERSION > 0x050100
     // Generate high-dpi pixmaps