Add Windows 7 warning in Russian (#82)

SS14.Launcher/Program.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Net.Http.Headers;
 using System.Runtime.InteropServices;
+using System.Threading;
 using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls;
@@ -131,11 +132,19 @@ private static unsafe void CheckWindows7()
         if (!OperatingSystem.IsWindows() || Environment.OSVersion.Version.Build >= 9600)
             return;
 
-        const string text =
+        var text =
             "You are using an old version of Windows that is no longer supported by Space Station 14.\n\n" +
             "If anything breaks, DO NOT ASK FOR HELP OR SUPPORT.";
 
-        const string caption = "Unsupported Windows version";
+        var caption = "Unsupported Windows version";
+
+        if (Language.UserHasLanguage("ru"))
+        {
+            text = "Вы используете старую версию Windows которая больше не поддерживается Space Station 14.\n\n" +
+                   "При возникновении ошибок НЕ БУДЕТ ОКАЗАНО НИКАКОЙ ПОДДЕРЖКИ.";
+
+            caption = "Неподдерживаемая версия Windows";
+        }
 
         fixed (char* pText = text)
         fixed (char* pCaption = caption)

SS14.Launcher/Utility/Language.cs

@@ -0,0 +1,19 @@
+using System.Threading;
+
+namespace SS14.Launcher.Utility;
+
+public static class Language
+{
+    /// <summary>
+    ///     Checks if the user's current culture or UI culture matches the given language.
+    /// </summary>
+    /// <param name="language">Two letter ISO language name, for example "ru".</param>
+    /// <returns>true if either the user's current culture or UI culture match the given language.</returns>
+    public static bool UserHasLanguage(string language)
+    {
+        var thread = Thread.CurrentThread;
+
+        return thread.CurrentCulture.TwoLetterISOLanguageName == language ||
+               thread.CurrentUICulture.TwoLetterISOLanguageName == language;
+    }
+}