GWT compilation fixes

desktop/src/io/anuke/mindustry/desktop/DesktopLauncher.java

@@ -27,6 +27,7 @@ import java.text.DateFormat;
 import java.text.NumberFormat;
 import java.text.SimpleDateFormat;
 import java.util.Date;
+import java.util.Locale;
 
 public class DesktopLauncher {
 	
@@ -86,6 +87,11 @@ public class DesktopLauncher {
 				JOptionPane.showMessageDialog(null, text);
 			}
 
+			@Override
+			public String getLocaleName(Locale locale){
+				return locale.getDisplayName(locale);
+			}
+
 			@Override
 			public void updateRPC() {
 				DiscordRichPresence presence = new DiscordRichPresence();