add splashscreen message when importing blocks via -loadblock

src/init.cpp

@@ -715,6 +715,7 @@ bool AppInit2()
 
     if (mapArgs.count("-loadblock"))
     {
+        uiInterface.InitMessage(_("Importing blocks..."));
         BOOST_FOREACH(string strFile, mapMultiArgs["-loadblock"])
         {
             FILE *file = fopen(strFile.c_str(), "rb");