lightweight variant (#1)

Reviewed-on: #1
Co-authored-by: Aleksandr Neychev <alexnejchev73@gmail.com>

CursorLang.Core/Services/ILocalizationService.cs

@@ -0,0 +1,25 @@
+using System.ComponentModel;
+
+namespace CursorLang.Core.Services;
+
+/// <summary>An interface language to choose from in the settings.</summary>
+/// <param name="Code">The culture code: "ru", "en".</param>
+/// <param name="DisplayName">The name in that very language.</param>
+public sealed record LanguageOption(string Code, string DisplayName)
+{
+    // Accessibility tools take the name of the list item from here
+    public override string ToString() => DisplayName;
+}
+
+/// <summary>
+/// Provides the interface strings and can change the language without a restart.
+/// </summary>
+public interface ILocalizationService : INotifyPropertyChanged
+{
+    /// <summary>The string for a resource key. Bindings update when the language changes.</summary>
+    string this[string key] { get; }
+
+    IReadOnlyList<LanguageOption> AvailableLanguages { get; }
+
+    string CurrentLanguage { get; set; }
+}