feat: Add on system language change callback

Author: jcs090218

Assets/JCSUnity/Scripts/Managers/JCS_AppManager.cs

@@ -17,6 +17,8 @@
 
 namespace JCSUnity
 {
+    public delegate void OnSystemLanguageChanged(SystemLanguage language);
+
     /// <summary>
     /// Manager manage application layer.
     /// </summary>
@@ -28,6 +30,8 @@ public class JCS_AppManager : JCS_Manager<JCS_AppManager>
         public static bool APP_QUITTING = false;
         public static bool APP_INITIALIZING = true;
 
+        public OnSystemLanguageChanged onSystemLanguageChanged = null;
+
         [Separator("Check Variables (JCS_AppManager)")]
 
         [Tooltip("Current systme language.")]
@@ -92,6 +96,9 @@ public SystemLanguage systemLanguage
             {
                 this.mSystemLanguage = value;
                 RefreshLangTexts();
+
+                if (onSystemLanguageChanged != null)
+                    onSystemLanguageChanged.Invoke(value);
             }
         }
         public bool RequestCamera { get { return this.mRequestCamera; } }