[QuickAccent]Multi-language selection (#35539)

* PowerAccent with multi-language selection

- Updated Language enum, method signatures, and settings to support multiple language selections.
- Remove ALL language and added special characters language instead.
- Modified UI to use ListView with checkboxes for language selection, including a "Select All" option.
- Adjusted ViewModel and code-behind to handle multi-selection logic.
- Updated Resources.resw and PowerAccentViewModel.cs to reflect these changes.

* Changes Language selection UI

- Groups languages into two groups
- Sort them by localized language name
- Remove unneeded looping when no languages selected

src/settings-ui/Settings.UI.Library/PowerAccentLanguageGroupModel.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    public class PowerAccentLanguageGroupModel : List<PowerAccentLanguageModel>
+    {
+        public PowerAccentLanguageGroupModel(List<PowerAccentLanguageModel> languages, string group)
+            : base(languages)
+        {
+            this.Group = group;
+        }
+
+        public string Group { get; init; }
+    }
+}