inform the user that database will be rebuilt. without UI, the old message was confusing.

src/init.cpp

@@ -738,7 +738,7 @@ bool AppInit2(boost::thread_group& threadGroup)
             // first suggest a reindex
             if (!fReset) {
                 /*bool fRet =*/ uiInterface.ThreadSafeMessageBox(
-                    strLoadError + ".\n\n" + _("Do you want to rebuild the block database now?"),
+                    strLoadError + ".\n\n" + _("Do you want to rebuild the block database now? (assuming YES)"),
                     "", CClientUIInterface::MSG_ERROR | CClientUIInterface::BTN_ABORT);
                 if (true /* [MF] fRet*/) {
                     fReindex = true;