ClientLanguageExtensions and usage

Dalamud/ClientLanguageExtensions.cs

@@ -0,0 +1,27 @@
+using System;
+
+namespace Dalamud
+{
+    /// <summary>
+    /// Extension methods for the <see cref="ClientLanguage"/> class.
+    /// </summary>
+    public static class ClientLanguageExtensions
+    {
+        /// <summary>
+        /// Converts a Dalamud ClientLanguage to the corresponding Lumina variant.
+        /// </summary>
+        /// <param name="language">Langauge to convert.</param>
+        /// <returns>Converted langauge.</returns>
+        public static Lumina.Data.Language ToLumina(this ClientLanguage language)
+        {
+            return language switch
+            {
+                ClientLanguage.Japanese => Lumina.Data.Language.Japanese,
+                ClientLanguage.English => Lumina.Data.Language.English,
+                ClientLanguage.German => Lumina.Data.Language.German,
+                ClientLanguage.French => Lumina.Data.Language.French,
+                _ => throw new ArgumentOutOfRangeException(nameof(language)),
+            };
+        }
+    }
+}