diff --git a/PKHeX.Core/Editing/LocalizeUtil.cs b/PKHeX.Core/Editing/LocalizeUtil.cs
new file mode 100644
index 000000000..46b3000a4
--- /dev/null
+++ b/PKHeX.Core/Editing/LocalizeUtil.cs
@@ -0,0 +1,32 @@
+using System.Threading.Tasks;
+
+namespace PKHeX.Core
+{
+    public static class LocalizeUtil
+    {
+        /// <summary>
+        /// Initializes PKHeX's runtime strings to the specified language.
+        /// </summary>
+        /// <param name="lang">2-char language ID</param>
+        /// <param name="sav">Save data (optional)</param>
+        /// <param name="hax">Permit illegal things (items, only)</param>
+        public static void InitializeStrings(string lang, SaveFile? sav = null, bool hax = false)
+        {
+            var str = GameInfo.Strings = GameInfo.GetStrings(lang);
+            if (sav != null)
+                GameInfo.FilteredSources = new FilteredGameDataSource(sav, GameInfo.Sources, hax);
+
+            // Update Legality Analysis strings
+            LegalityAnalysis.MoveStrings = str.movelist;
+            LegalityAnalysis.SpeciesStrings = str.specieslist;
+
+            // Update Legality Strings
+            Task.Run(() =>
+            {
+                RibbonStrings.ResetDictionary(str.ribbons);
+                Util.SetLocalization(typeof(LegalityCheckStrings), lang);
+                Util.SetLocalization(typeof(MessageStrings), lang);
+            });
+        }
+    }
+}
diff --git a/PKHeX.WinForms/MainWindow/Main.cs b/PKHeX.WinForms/MainWindow/Main.cs
index 145b79a39..83a772932 100644
--- a/PKHeX.WinForms/MainWindow/Main.cs
+++ b/PKHeX.WinForms/MainWindow/Main.cs
@@ -917,7 +917,7 @@ private void ChangeMainLanguage(object sender, EventArgs e)
 
             Menu_Options.DropDown.Close();
 
-            InitializeStrings();
+            LocalizeUtil.InitializeStrings(CurrentLanguage, C_SAV.SAV, HaX);
             WinFormsUtil.TranslateInterface(this, CurrentLanguage); // Translate the UI to language.
             if (C_SAV.SAV != null)
             {
@@ -928,26 +928,6 @@ private void ChangeMainLanguage(object sender, EventArgs e)
                 Text = GetProgramTitle(sav);
             }
         }
-
-        private void InitializeStrings()
-        {
-            string l = CurrentLanguage;
-            GameInfo.Strings = GameInfo.GetStrings(l);
-            if (C_SAV.SAV != null)
-                GameInfo.FilteredSources = new FilteredGameDataSource(C_SAV.SAV, GameInfo.Sources, HaX);
-
-            // Update Legality Strings
-            Task.Run(() => {
-                    var lang = Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName.Substring(0, 2);
-                    Util.SetLocalization(typeof(LegalityCheckStrings), lang);
-                    Util.SetLocalization(typeof(MessageStrings), lang);
-                    RibbonStrings.ResetDictionary(GameInfo.Strings.ribbons);
-                });
-
-            // Update Legality Analysis strings
-            LegalityAnalysis.MoveStrings = GameInfo.Strings.movelist;
-            LegalityAnalysis.SpeciesStrings = GameInfo.Strings.specieslist;
-        }
         #endregion
 
         #region //// PKX WINDOW FUNCTIONS ////