Savegame dialog: use locale-aware datetime format

apps/openmw/mwgui/savegamedialog.cpp

@@ -241,7 +241,13 @@ namespace MWGui
         struct tm* timeinfo;
         timeinfo = localtime(&time);
 
-        text << asctime(timeinfo) << "\n";
+        // Use system/environment locale settings for datetime formatting
+        std::setlocale(LC_TIME, "");
+
+        const int size=1024;
+        char buffer[size];
+        if (std::strftime(buffer, size, "%x %X", timeinfo) > 0)
+            text << buffer << "\n";
         text << "Level " << slot->mProfile.mPlayerLevel << "\n";
         text << slot->mProfile.mPlayerCell << "\n";
         // text << "Time played: " << slot->mProfile.mTimePlayed << "\n";