Localizer.cs

using System;
using UnityEngine;
using System.Collections.Generic;
using System.Linq;

public class Localizer : MonoBehaviour
{
    public static SystemLanguage[] AvailableLanguages
    {
        get { return _localizedStrings.Keys.ToArray(); }
    }

    static Dictionary<SystemLanguage, Dictionary<string, string>> _localizedStrings;

    void Awake ()
    {
        _localizedStrings = new Dictionary<SystemLanguage,Dictionary<string,string>>();

        foreach (var language in Enum.GetValues(typeof(SystemLanguage)))
        {
            var localizedStringsByLanguage = new Dictionary<string, string>();

            try
            {
                foreach (var stringsAsset in Resources.LoadAll<TextAsset>(
                    "Localization/" + language + "/Strings"))
                {
                    var stringsJeli = UJeli.Parse(stringsAsset.text);

                    foreach (var stringJeli in stringsJeli.Children)
                    {
                        localizedStringsByLanguage[stringJeli.Name] = stringJeli.Value.Replace("\\n", "\n");
                    }
                }

                _localizedStrings.Add((SystemLanguage)language, localizedStringsByLanguage);
            }
            catch { continue; }
        }
    }

    public static string GetString (string key, SystemLanguage language = SystemLanguage.Unknown)
    {
        if (language == SystemLanguage.Unknown)
            language = GameClient.Instance.Config.UI.Language;
    
        Dictionary<string, string> localizedLanguage = null;

        if (!_localizedStrings.TryGetValue(language, out localizedLanguage))
            return key;

        string localizedString = null;

        if (!localizedLanguage.TryGetValue(key, out localizedString))
            return key;

        return localizedString;
    }
}