Use PanicAlertT instead of PanicAlert when appropriate

I tried to change messages that contained instructions for users,
while avoiding messages that are so technical that most users
wouldn't understand them even if they were in the right language.

Source/Core/Core/Core.cpp

@@ -430,7 +430,7 @@ void EmuThread()
 	{
 		HW::Shutdown();
 		g_video_backend->Shutdown();
-		PanicAlert("Failed to initialize DSP emulator!");
+		PanicAlert("Failed to initialize DSP emulation!");
 		Host_Message(WM_USER_STOP);
 		return;
 	}