How to manage Variations in SharePoint 2013 via CSOM

VariationsClient.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using Microsoft.SharePoint.Client;

namespace Publishing
{
    /// <summary>
    /// Variations Client
    /// </summary>
    class VariationsClient
    {

        public VariationsClient(ClientContext context)
        {
            _labelsList = GetLabelsList(context);
        }

        /// <summary>
        /// Create Variation Label
        /// </summary>
        /// <param name="cultureInfo"></param>
        /// <param name="isSource"></param>
        public void CreateLabel(CultureInfo cultureInfo,bool isSource)
        {
            var entry = new VariationLabelEntry
                {
                    DisplayName = cultureInfo.DisplayName,
                    IsSource = isSource,
                    Locale = cultureInfo.LCID,
                    Language = cultureInfo.Name,
                    Title = cultureInfo.Name,
                };
            var variationWebUrl = string.Format("{0}/{1}", RootWebUrl, (isSource ?  string.Empty : cultureInfo.Name));
            entry.TopWebUrl = new FieldUrlValue { Url = variationWebUrl };
            SaveLabel(entry);
        }

        /// <summary>
        /// Retrieve Variation Labels 
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public List<VariationLabelEntry> LoadLabels(ClientContext context)
        {
            var labelItems = _labelsList.GetItems(CamlQuery.CreateAllItemsQuery());
            context.Load(labelItems);
            context.ExecuteQuery();
            return labelItems.Select(labelItem => VariationLabelEntry.Parse(labelItem)).ToList();
        }



        /// <summary>
        /// Get Labels List
        /// </summary>
        private static List GetLabelsList(ClientContext context)
        {
            var rootWeb = context.Site.RootWeb;
            context.Load(rootWeb, w => w.AllProperties, w => w.Url);
            context.ExecuteQuery();
            var varLabelsListId = new Guid(rootWeb.AllProperties[VarLabelsListIdKey].ToString());
            return rootWeb.Lists.GetById(varLabelsListId);
        }

        /// <summary>
        /// Save Variation Label 
        /// </summary>
        /// <param name="entry"></param>
        public void SaveLabel(VariationLabelEntry entry)
        {
            var labelItem = _labelsList.AddItem(new ListItemCreationInformation());
            labelItem[VariationLabelFieldNames.Language] = entry.Language;
            labelItem[VariationLabelFieldNames.IsSource] = entry.IsSource;
            labelItem[VariationLabelFieldNames.Locale] = entry.Locale.ToString(CultureInfo.InvariantCulture);
            labelItem[VariationLabelFieldNames.Title] = entry.Title;
            labelItem[VariationLabelFieldNames.TopWebUrl] = entry.TopWebUrl;
            labelItem[VariationLabelFieldNames.DisplayName] = entry.DisplayName;
            labelItem[VariationLabelFieldNames.HierarchyIsCreated] = false;
            labelItem[VariationLabelFieldNames.HierarchyCreationMode] = HierarchyCreationMode.PublishingSitesAndAllPages;
            labelItem[VariationLabelFieldNames.NotificationMode] = false;
            labelItem.Update();
            _labelsList.Context.ExecuteQuery();
        }

        /// <summary>
        /// Variation Root Web Url
        /// </summary>
        public string RootWebUrl
        {
            get
            {
                return Context.Site.RootWeb.Url;
            }
        }

        /// <summary>
        /// Client Context
        /// </summary>
        private ClientContext Context
        {
            get { return _labelsList.Context as ClientContext; }
        }


        private readonly List _labelsList;

        private const string VarLabelsListIdKey = "_VarLabelsListId";
    }



    /// <summary>
    /// Variation Label Entry  
    /// </summary>
    class VariationLabelEntry
    {
        /// <summary>
        /// Convert Label List Item into Variation Label Entity
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public static VariationLabelEntry Parse(ListItem item)
        {
            var label = new VariationLabelEntry
                {
                    IsSource = bool.Parse(item[VariationLabelFieldNames.IsSource].ToString()),
                    Language = item[VariationLabelFieldNames.Language].ToString(),
                    Locale = int.Parse(item[VariationLabelFieldNames.Locale].ToString()),
                    Title = item[VariationLabelFieldNames.Title].ToString(),
                    TopWebUrl = (FieldUrlValue) item[VariationLabelFieldNames.TopWebUrl],
                    DisplayName = item[VariationLabelFieldNames.DisplayName].ToString(),
                    HierarchyIsCreated = bool.Parse(item[VariationLabelFieldNames.HierarchyIsCreated].ToString()),
                    NotificationMode = bool.Parse(item[VariationLabelFieldNames.NotificationMode].ToString()),
                    HierarchyCreationMode = item[VariationLabelFieldNames.HierarchyCreationMode].ToString()
                };
            return label;
        }

        #region Properties

        public string DisplayName { get; set; }

        public bool IsSource { get; set; }

        public string Language { get; set; }

        public int Locale { get; set; }

        public string Title { get; set; }

        public string Description { get; set; }

        public FieldUrlValue TopWebUrl { get; set; }

        public bool HierarchyIsCreated { get; private set; }

        public bool NotificationMode { get; set; }

        public bool? IsMachineTranslationEnabled { get; set; }

        public bool? IsHumanTranslationEnabled { get; set; }

        public int? MachineTranslationLanguage { get; set; }

        public int? HumanTranslationLanguage { get; set; }

        public string HierarchyCreationMode { get; set; }

        #endregion
    }

    public static class VariationLabelFieldNames
    {
        public static string IsSource = "Is_x0020_Source";
        public static string Language = "Language";
        public static string Locale = "Locale";
        public static string Title = "Title";
        public static string TopWebUrl = "Top_x0020_Web_x0020_URL";
        public static string DisplayName = "Flag_x0020_Control_x0020_Display";
        public static string HierarchyIsCreated = "Hierarchy_x0020_Is_x0020_Created";
        public static string NotificationMode = "NotificationMode";
        public static string IsMachineTranslationEnabled = "IsMachineTranslationEnabledField";
        public static string IsHumanTranslationEnabled = "IsHumanTranslationEnabledFieldNa";
        public static string MachineTranslationLanguage = "MachineTranslationLanguageFieldN";
        public static string HumanTranslationLanguage = "HumanTranslationLanguageFieldNam";
        public static string HierarchyCreationMode = "Hierarchy_x0020_Creation_x0020_M";
    }

    public sealed class HierarchyCreationMode
    {
        public static readonly string PublishingSitesAndAllPages = ("Publishing Sites and All Pages");
        public static readonly string PublishingSitesOnly = ("Publishing Sites Only");
        public static readonly string RootSiteOnly = ("Root Site Only"); 
    }
}