Show key descriptions with Polish letters

The game's key file has its descriptions stripped of them. Where a
description is the bundled one without the letters, the bundled one is
shown; the file itself is left as it is.

StarterNG.Tests/KeyboardConfigTests.cs

@@ -0,0 +1,10 @@
+using StarterNG.Classes;
+
+namespace StarterNG.Tests;
+
+public class KeyboardConfigTests
+{
+    [Fact]
+    public void A_description_without_polish_letters_matches_the_bundled_one() =>
+        Assert.Equal("zwiekszenie nastawnika glownego", KeyboardConfig.StripPolish("zwiększenie nastawnika głównego"));
+}