Add titlecase display for language options

StabilityMatrix.Avalonia/Converters/CultureInfoDisplayConverter.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace StabilityMatrix.Avalonia.Converters;
+
+public class CultureInfoDisplayConverter : IValueConverter
+{
+    /// <inheritdoc />
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is not CultureInfo cultureInfo)
+            return null;
+
+        return cultureInfo.TextInfo.ToTitleCase(cultureInfo.NativeName);
+    }
+
+    /// <inheritdoc />
+    public object ConvertBack(
+        object? value,
+        Type targetType,
+        object? parameter,
+        CultureInfo culture
+    )
+    {
+        throw new NotImplementedException();
+    }
+}

StabilityMatrix.Avalonia/Views/SettingsPage.axaml

@@ -10,12 +10,17 @@
     xmlns:ui="using:FluentAvalonia.UI.Controls"
     xmlns:vm="clr-namespace:StabilityMatrix.Avalonia.ViewModels"
     xmlns:lang="clr-namespace:StabilityMatrix.Avalonia.Languages"
+    xmlns:converters="clr-namespace:StabilityMatrix.Avalonia.Converters"
     d:DataContext="{x:Static mocks:DesignData.SettingsViewModel}"
     d:DesignHeight="700"
     d:DesignWidth="800"
     x:CompileBindings="True"
     x:DataType="vm:SettingsViewModel"
     mc:Ignorable="d">
+    
+    <controls:UserControlBase.Resources>
+        <converters:CultureInfoDisplayConverter x:Key="CultureInfoDisplayConverter" />
+    </controls:UserControlBase.Resources>
 
     <ScrollViewer VerticalScrollBarVisibility="Auto">
         <StackPanel Margin="8,16" Spacing="8">
@@ -46,7 +51,7 @@
                         <ComboBox
                             MinWidth="100"
                             ItemsSource="{Binding AvailableLanguages}"
-                            DisplayMemberBinding="{Binding NativeName}"
+                            DisplayMemberBinding="{Binding Converter={StaticResource CultureInfoDisplayConverter}}"
                             SelectedItem="{Binding SelectedLanguage}" />
                     </ui:SettingsExpander.Footer>
                 </ui:SettingsExpander>