Fix encoding issue in MacOS (#1962)

gframe/gframe.cpp

@@ -2,6 +2,7 @@
 #include "game.h"
 #include "data_manager.h"
 #include <event2/thread.h>
+#include <locale.h>
 
 int enable_log = 0;
 bool exit_on_return = false;
@@ -33,6 +34,9 @@ void ClickButton(irr::gui::IGUIElement* btn) {
 }
 
 int main(int argc, char* argv[]) {
+#ifndef _WIN32
+        setlocale(LC_CTYPE, "UTF-8");
+#endif
 #ifdef _WIN32
 #ifndef _DEBUG
 	wchar_t exepath[MAX_PATH];