Implement O5Kit

Localization/LocalizationManager.cs

@@ -165,7 +165,7 @@ internal static class LocalizationManager
     public static string Get(string key, params object[] args)
     {
         var template = Get(key);
-        if (args == null || args.Length == 0) return template;
+        if (args.Length == 0) return template;
 
         try
         {
@@ -185,7 +185,6 @@ internal static class LocalizationManager
         return language switch
         {
             SystemLanguage.Korean => "ko",
-            SystemLanguage.English => "en",
             _ => "en"
         };
     }
@@ -218,6 +217,7 @@ internal static class LocalizationManager
 /// <summary>
 /// Convenient shorthand alias for <see cref="LocalizationManager"/>.
 /// </summary>
+// ReSharper disable once InconsistentNaming
 internal static class I18n
 {
     /// <inheritdoc cref="LocalizationManager.Get(string)"/>