[DIY] Need some help supporting localization on a game and updating UI when a language is selected

Hi there,

This is sort of the continuation of a question I posted yesterday. I am aware that many assets exist in the Unity Assets Store, but I would like to do it myself for knowledge sake and "just do it, don't let your dreams be dreams".

I would like to support localization in my game, and I was mainly inspired by the Android localization format, meaning storing my strings into .xml files and getting them using a Language Loader :

 using CustomDictionary = System.Collections.Generic.Dictionary<string, string>;
 using System;
 using System.Collections;
 using System.IO;
 using System.Xml;
 
 public class                    LanguageLoader {
 
     private CustomDictionary    Strings;
     private string              DefaultString;
 
     public                      LanguageLoader() {
         this.Strings = new CustomDictionary();
         this.DefaultString = null;
     }
 
     public void                 Clear() {
         this.Strings.Clear();
     }
 
     public void                 Load(string path, string countryCode) {
         XmlDocument             xmlDocument;
         XmlElement              rootElement, element;
         IEnumerator             elementEnumerator;
 
         xmlDocument = new XmlDocument();
         try {
             xmlDocument.Load(Path.Combine(path, this.GetXmlLanguageFile(countryCode)));
             rootElement = xmlDocument.DocumentElement;
             if (rootElement == null || !("language".Equals(rootElement.Name)))
                 throw (new XmlException("Invalid root element !"));
             if (!rootElement.GetAttribute("code").Equals(countryCode))
                 throw (new XmlException("Country codes are different !"));
             elementEnumerator = rootElement.GetEnumerator();
             while (elementEnumerator.MoveNext()) {
                 element = (XmlElement) elementEnumerator.Current;
                 if (element.GetAttribute("name") == null || element.InnerText == null)
                     throw (new XmlException("Invalid string !"));
                 this.Strings.Add(element.GetAttribute("name"), element.InnerText);
             }
         } catch (XmlException exc) {
             UnityEngine.Debug.LogException(exc);
         }
 
     }
 
     public void                 SetDefaultString(string defaultString) {
         this.DefaultString = defaultString;
     }
 
     public string               GetXmlLanguageFile(string countryCode) {
         return (String.Concat(countryCode.Trim(), ".xml"));
     }
 
     public string               GetString(string key) {
         string                  returnedString = this.DefaultString;
 
         if (this.Strings.ContainsKey(key))
             returnedString = this.Strings[key];
         return (returnedString);
     }
 }

The .xml language file is well stored and I am able to get a string without any problem. My problem is that I don't know how to update my UI correctly when a language is selected by the user. For example, I have a main menu which contains four buttons (see the link above for a visual approach) and these four buttons have to be translated using localization. For this, I made a Menu Manager which contains a function that translates the buttons at start, but I find it really gross :

     public void             InitializeMainMenu() {
         this.MainMenu.transform.Find("Character Demo Button").GetChild(0).gameObject.GetComponent<Text>().text = this.Localization.GetString("text_playy_character_demo");
         this.MainMenu.transform.Find("Turn-based Demo Button").GetChild(0).gameObject.GetComponent<Text>().text = this.Localization.GetString("text_play_turnbased_demo");
         this.MainMenu.transform.Find("Languages Button").GetChild(0).gameObject.GetComponent<Text>().text = this.Localization.GetString("text_languages_menu");
         this.MainMenu.transform.Find("Quit Button").GetChild(0).gameObject.GetComponent<Text>().text = this.Localization.GetString("text_quit_game");
         this.MainMenu.SetActive(true);
     }

The further problem is when the user will select a language : is there any Unity function that updates the GUI once ? I heard about OnGUI() but I feel like this is useless to repeat this code every frame.

I apologize if I can't be more explicit and I'll try to give you more details as the discussion goes.