Read the old starter's key descriptions in code page 1250 too

Its language files are code page 1250 as often as UTF-8. Read as UTF-8 only,
Czech and Polish descriptions came out with replacement characters.

StarterNG.Tests/LocalizationTests.cs

@@ -190,6 +190,20 @@ public class LocalizationTests
         Assert.Equal(string.Empty, loc.Opt("Cmd.z"));
     }
 
+    [Fact]
+    public void An_old_starters_key_descriptions_are_read_in_its_own_code_page()
+    {
+        using var folders = new Folders();
+        File.WriteAllText(Path.Combine(folders.Bundled, "en.xml"), English);
+        File.WriteAllBytes(Path.Combine(folders.OldStarter, "lang-cz.txt"), LegacyText.CodePage1250.GetBytes(
+            "[labels]\r\n<eu07_input-keyboard.ini\r\nhornhighactivate=Houkačka výšková\r\n\r\n"));
+        var loc = folders.Service();
+
+        loc.Load("cz");
+
+        Assert.Equal("Houkačka výšková", loc.Opt("Cmd.hornhighactivate"));
+    }
+
     [Fact]
     public void Of_the_simulators_files_only_a_language_code_counts()
     {

StarterNG/Services/LocalizationService.cs

@@ -3,10 +3,10 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.IO;
 using System.Linq;
-using System.Text;
 using System.Text.RegularExpressions;
 using System.Xml;
 using StarterNG.Application.Abstractions;
+using StarterNG.Infrastructure.Adapters;
 
 namespace StarterNG.Services;
 
@@ -286,8 +286,9 @@ public class LocalizationService : INotifyPropertyChanged, ILocalizedStrings
             if (path is null)
                 return;
 
+            // The old starter's own files are code page 1250 as often as UTF-8.
             bool inDescriptions = false;
-            foreach (string line in File.ReadLines(path, Encoding.UTF8))
+            foreach (string line in LegacyText.Decode(File.ReadAllBytes(path)).ReplaceLineEndings("\n").Split('\n'))
             {
                 if (line.Contains("<eu07_input-keyboard.ini", StringComparison.Ordinal))
                 {