Change Chinese Language Localization Names (#1749)

* locale name standardize

* change ko back to English

* cn -> zh

* Change Chinese localization mapping

- Maps tw to zh-hant, and zh to zh-hans
- Removes explicit override for tw langcode in UI
- Makes all languages use Windows-provided name and capitalization
- Add note to ko to prevent accidental helpful PRs

---------

Co-authored-by: wozaiha <wozaiha@gmail.com>

Dalamud/Interface/Internal/Windows/Settings/Widgets/LanguageChooserSettingsEntry.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
@@ -36,14 +36,14 @@ public sealed class LanguageChooserSettingsEntry : SettingsEntry
                 switch (language)
                 {
                     case "ko":
+                        // We're intentionally keeping this in English, as the Korean fonts are not loaded in unless
+                        // the language is already Korean or other preconditions are met. It's excessive to load a font
+                        // for two characters.
                         locLanguagesList.Add("Korean");
                         break;
-                    case "tw":
-                        locLanguagesList.Add("中華民國國語");
-                        break;
                     default:
-                        string locLanguage = CultureInfo.GetCultureInfo(language).NativeName;
+                        var loc = Localization.GetCultureInfoFromLangCode(language);
-                        locLanguagesList.Add(char.ToUpper(locLanguage[0]) + locLanguage[1..]);
+                        locLanguagesList.Add(loc.TextInfo.ToTitleCase(loc.NativeName));
                         break;
                 }
             }

Dalamud/Localization.cs

@@ -70,14 +70,15 @@ public class Localization : IServiceType
     public CultureInfo DalamudLanguageCultureInfo { get; private set; }
 
     /// <summary>
-    /// Gets an instance of <see cref="CultureInfo"/> that corresponds to <paramref name="langCode"/>.
+    /// Gets an instance of <see cref="CultureInfo"/> that corresponds to a Dalamud <paramref name="langCode"/>.
     /// </summary>
     /// <param name="langCode">The language code which should be in <see cref="ApplicableLangCodes"/>.</param>
     /// <returns>The corresponding instance of <see cref="CultureInfo"/>.</returns>
     public static CultureInfo GetCultureInfoFromLangCode(string langCode) =>
         CultureInfo.GetCultureInfo(langCode switch
         {
-            "tw" => "zh-tw",
+            "tw" => "zh-hant",
+            "zh" => "zh-hans",
             _ => langCode,
         });