Reworked LocalizationManager to load data async

MediaBrowser.Controller/Extensions/StringExtensions.cs

@@ -1,4 +1,8 @@
-using MediaBrowser.Model.Globalization;
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
 
 namespace MediaBrowser.Controller.Extensions
 {
@@ -7,11 +11,45 @@ namespace MediaBrowser.Controller.Extensions
     /// </summary>
     public static class StringExtensions
     {
-        public static ILocalizationManager LocalizationManager { get; set; }
-
         public static string RemoveDiacritics(this string text)
         {
-            return LocalizationManager.RemoveDiacritics(text);
+            if (text == null)
+            {
+                throw new ArgumentNullException(nameof(text));
+            }
+
+            var chars = Normalize(text, NormalizationForm.FormD)
+                .Where(ch => CharUnicodeInfo.GetUnicodeCategory(ch) != UnicodeCategory.NonSpacingMark);
+
+            return Normalize(string.Concat(chars), NormalizationForm.FormC);
+        }
+
+        private static string Normalize(string text, NormalizationForm form, bool stripStringOnFailure = true)
+        {
+            if (stripStringOnFailure)
+            {
+                try
+                {
+                    return text.Normalize(form);
+                }
+                catch (ArgumentException)
+                {
+                    // will throw if input contains invalid unicode chars
+                    // https://mnaoumov.wordpress.com/2014/06/14/stripping-invalid-characters-from-utf-16-strings/
+                    text = Regex.Replace(text, "([\ud800-\udbff](?![\udc00-\udfff]))|((?<![\ud800-\udbff])[\udc00-\udfff])", "");
+                    return Normalize(text, form, false);
+                }
+            }
+
+            try
+            {
+                return text.Normalize(form);
+            }
+            catch (ArgumentException)
+            {
+                // if it still fails, return the original text
+                return text;
+            }
         }
     }
 }