Add option to display/hide localized names

Fix #49

src/twitch/twitchmessagebuilder.hpp

@@ -18,6 +18,12 @@ namespace twitch {
 class TwitchMessageBuilder : public messages::MessageBuilder
 {
 public:
+    enum UsernameDisplayMode : int {
+        Username = 1,                  // Username
+        LocalizedName = 2,             // Localized name
+        UsernameAndLocalizedName = 3,  // Username (Localized name)
+    };
+
     TwitchMessageBuilder() = delete;
 
     explicit TwitchMessageBuilder(Channel *_channel, Resources &_resources,