Determines culture to be used

LocalisationHelper.cs

public class LocalisationHelper
    {
        public static List<string> Cultures
        {
            get { return new[] {"en-GB", "es"}.ToList(); }
        }
        public static string DefaultCulture
        {
            get { return Cultures[0]; }
        }
        /// <summary>
        /// Gets a similar culture to the one passed (e.g. if en-US passed, returns nearest en-GB),
        /// or returns default
        /// </summary>
        public static string GetCulture(string culture)
        {
            string result = null;

            if (Cultures.Contains(culture))
            {
                return culture;
            }

            Cultures.ToList().ForEach(c =>
            {
                if (c.Substring(0, 2) == culture.Substring(0, 2))
                {
                    result = c;
                }
            });

            if (string.IsNullOrEmpty(result))
            {
                result = DefaultCulture;
            }

            return result;
        }

        public static bool CultureImplemented(string culture)
        {
            return Cultures.ToList().Contains(culture);
        }
    }