[QuickAccent]Add Bulgarian (#33550)

## Summary of the Pull Request
Adds Bulgarian to Quick Accent

## Detailed Description of the Pull Request / Additional comments
Adds Cyrillic letter short I (й)

src/modules/poweraccent/PowerAccent.Core/Languages.cs

@@ -10,6 +10,7 @@ namespace PowerAccent.Core
     public enum Language
     {
         ALL,
+        BG,
         CA,
         CRH,
         CUR,
@@ -54,7 +55,8 @@ namespace PowerAccent.Core
         {
             return lang switch
             {
-                Language.ALL => GetDefaultLetterKeyALL(letter), // ALL
+                Language.ALL => GetDefaultLetterKeyALL(letter), // All
+                Language.BG => GetDefaultLetterKeyBG(letter), // Bulgarian
                 Language.CA => GetDefaultLetterKeyCA(letter), // Catalan
                 Language.CRH => GetDefaultLetterKeyCRH(letter), // Crimean Tatar
                 Language.CUR => GetDefaultLetterKeyCUR(letter), // Currency
@@ -103,7 +105,8 @@ namespace PowerAccent.Core
         {
             if (!_allLanguagesCache.TryGetValue(letter, out string[] cachedValue))
             {
-                cachedValue = GetDefaultLetterKeyCA(letter)
+                cachedValue = GetDefaultLetterKeyBG(letter)
+                .Union(GetDefaultLetterKeyCA(letter))
                 .Union(GetDefaultLetterKeyCRH(letter))
                 .Union(GetDefaultLetterKeyCUR(letter))
                 .Union(GetDefaultLetterKeyCY(letter))
@@ -198,6 +201,16 @@ namespace PowerAccent.Core
             };
         }
 
+        // Bulgarian
+        private static string[] GetDefaultLetterKeyBG(LetterKey letter)
+        {
+            return letter switch
+            {
+                LetterKey.VK_I => new[] { "й" },
+                _ => Array.Empty<string>(),
+            };
+        }
+
         // Crimean Tatar
         private static string[] GetDefaultLetterKeyCRH(LetterKey letter)
         {

src/settings-ui/Settings.UI/SettingsXAML/Views/PowerAccentPage.xaml

@@ -53,6 +53,7 @@
                         <ComboBox MinWidth="{StaticResource SettingActionControlMinWidth}" SelectedIndex="{x:Bind Path=ViewModel.SelectedLangIndex, Mode=TwoWay}">
                             <!--  These should be in the same order as the array items in PowerAccentViewModel.cs  -->
                             <ComboBoxItem x:Uid="QuickAccent_SelectedLanguage_All" />
+                            <ComboBoxItem x:Uid="QuickAccent_SelectedLanguage_Bulgarian" />
                             <ComboBoxItem x:Uid="QuickAccent_SelectedLanguage_Catalan" />
                             <ComboBoxItem x:Uid="QuickAccent_SelectedLanguage_Crimean" />
                             <ComboBoxItem x:Uid="QuickAccent_SelectedLanguage_Currency" />

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -3444,6 +3444,9 @@ Activate by holding the key for the character you want to add an accent to, then
   <data name="QuickAccent_SelectedLanguage_All.Content" xml:space="preserve">
     <value>All available</value>
   </data>
+  <data name="QuickAccent_SelectedLanguage_Bulgarian.Content" xml:space="preserve">
+    <value>Bulgarian</value>
+  </data>
   <data name="QuickAccent_SelectedLanguage_Catalan.Content" xml:space="preserve">
     <value>Catalan</value>
   </data>

src/settings-ui/Settings.UI/ViewModels/PowerAccentViewModel.cs

@@ -24,6 +24,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
         private readonly string[] _languageOptions =
         {
             "ALL",
+            "BG",
             "CA",
             "CRH",
             "CUR",