Unity localization example

LocalizedText.cs

using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Text))]
public class LocalizedText : MonoBehaviour {

    // Use this for initialization
    void Awake() {
        var stringId = gameObject.name;
        var language = Application.systemLanguage;
        var message = Strings.GetLocalized(stringId, language);
        GetComponent<Text>().text = message;
    }
}

Strings.cs

using System.Collections.Generic;
using UnityEngine;
using RegistryDictionary = System.Collections.Generic.Dictionary<string, System.Collections.Generic.IList<string>>;
using LocalizationsRegistry = System.Collections.Generic.Dictionary
<UnityEngine.SystemLanguage, System.Collections.Generic.Dictionary<string, System.Collections.Generic.IList<string>>
>;
using Random = System.Random;

public class Strings {
    private const int SupportedLanguagesCount = 5;
    private const int PhrasesCount = 10;
    private const string Placeholder = "placeholder";
    private const SystemLanguage DefaultLanguage = SystemLanguage.Russian;


    private static readonly Random Randomizer = new Random();

    private static LocalizationsRegistry _stringsRegistry;

    private Strings() {
        // instance is forbidden
    }

    private static LocalizationsRegistry StringsRegistry {
        // lazy init of dictionaries
        get { return _stringsRegistry ?? (_stringsRegistry = CreateLocalizationsRegistry(SupportedLanguagesCount)); }
    }

    /// <summary>
    ///     Localized string by string key
    /// </summary>
    /// <param name="stringId">Key of string</param>
    /// <param name="lang">Locale you want to get</param>
    /// <param name="notFound">Tect which will be returned if nothing found</param>
    /// <returns></returns>
    public static string GetLocalized(string stringId, SystemLanguage lang, string notFound = null) {
        // check lang is supported
        if (StringsRegistry.ContainsKey(lang)) {
            var dict = StringsRegistry[lang];
            if (!dict.ContainsKey(stringId)) // check contains value
                return lang == DefaultLanguage ? notFound ?? Placeholder : GetLocalized(stringId, DefaultLanguage);
            var variants = dict[stringId];
            // check value
            switch (variants.Count) {
                case 0: // empty entry
                    return notFound ?? Placeholder;
                case 1: // only one value
                    return variants[0];
                default: // multiple values, should select one randomly
                    return variants[Randomizer.Next(0, variants.Count)];
            }
        }
        return lang == DefaultLanguage ? notFound ?? Placeholder : GetLocalized(stringId, DefaultLanguage);
    }

    #region Loacalization init

    private static LocalizationsRegistry CreateLocalizationsRegistry(int capacity) {
        return new LocalizationsRegistry(capacity) {
            {SystemLanguage.Russian, CreateDictionaryRussian()} // Russian support
        };
    }

    // This should be generated but YAGNI and stuff
    private static RegistryDictionary CreateDictionaryRussian() {
        var localizedDictionary = new RegistryDictionary(PhrasesCount);
        // подсказки с рандомом
        var hints = new List<string> {
            "message 1",
            "message 2",
            "message 3",
            "message 4",
            "message 5",
            "message 6",
            "message 7"
        };
        localizedDictionary.Add("Helper", hints);

        // первая часть текста с экрана инфы в мэйн меню
        var mainMenuInfo1 = new List<string> {
            "info 1"
        };
        localizedDictionary.Add("MainMenuInfo1", mainMenuInfo1);

        // вторая часть текста с экрана инфы в мэйн меню
        var mainMenuInfo2 = new List<string> {
            "info 2"
        };
        localizedDictionary.Add("MainMenuInfo2", mainMenuInfo2);

        return localizedDictionary;
    }

    #endregion
}