Fix language detection

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

shadowsocks-csharp/Controller/I18N.cs

@@ -7,11 +7,11 @@ namespace Shadowsocks.Controller
 {
     using Shadowsocks.Properties;
 
-    public class I18N
+    public static class I18N
     {
-        protected static Dictionary<string, string> Strings;
+        private static Dictionary<string, string> _strings = new Dictionary<string, string>();
 
-        static void Init(string res)
+        private static void Init(string res)
         {
             using (var sr = new StringReader(res))
             {
@@ -23,38 +23,28 @@ namespace Shadowsocks.Controller
                     var pos = line.IndexOf('=');
                     if (pos < 1)
                         continue;
-                    Strings[line.Substring(0, pos)] = line.Substring(pos + 1);
+                    _strings[line.Substring(0, pos)] = line.Substring(pos + 1);
                 }
             }
         }
 
         static I18N()
         {
-            Strings = new Dictionary<string, string>();
-            string name = CultureInfo.CurrentCulture.Name;
-            if (name.StartsWith("zh"))
+            string name = CultureInfo.CurrentCulture.EnglishName;
+            if (name.StartsWith("Chinese", StringComparison.OrdinalIgnoreCase))
             {
-                if (name == "zh" || name == "zh-CN")
-                {
-                    Init(Resources.cn);
-                }
-                else
-                {
-                    Init(Resources.zh_tw);
-                }
+                // choose Traditional Chinese only if we get explicit indication
+                Init(name.Contains("Traditional")
+                    ? Resources.zh_tw
+                    : Resources.cn);
             }
         }
 
         public static string GetString(string key)
         {
-            if (Strings.ContainsKey(key))
-            {
-                return Strings[key];
-            }
-            else
-            {
-                return key;
-            }
+            return _strings.ContainsKey(key)
+                ? _strings[key]
+                : key;
         }
     }
 }