localization: update English translation

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Resources/Locales/en_US.axaml

@@ -852,7 +852,7 @@
   <x:String x:Key="Text.Stash.Message" xml:space="preserve">Message:</x:String>
   <x:String x:Key="Text.Stash.Message.Placeholder" xml:space="preserve">Optional. Message of this stash</x:String>
   <x:String x:Key="Text.Stash.Mode" xml:space="preserve">Mode:</x:String>
-  <x:String x:Key="Text.Stash.OnlyStagedChanges" xml:space="preserve">Only staged changes</x:String>
+  <x:String x:Key="Text.Stash.OnlyStagedChanges" xml:space="preserve">Only staged files</x:String>
   <x:String x:Key="Text.Stash.TipForSelectedFiles" xml:space="preserve">Both staged and unstaged changes of selected file(s) will be stashed!!!</x:String>
   <x:String x:Key="Text.Stash.Title" xml:space="preserve">Stash Local Changes</x:String>
   <x:String x:Key="Text.StashCM.Apply" xml:space="preserve">Apply</x:String>

src/Views/StashChanges.axaml

@@ -61,7 +61,7 @@
                 Content="{DynamicResource Text.Stash.OnlyStagedChanges}"
                 IsChecked="{Binding OnlyStaged, Mode=TwoWay}"
                 IsVisible="{Binding !HasSelectedFiles}"
-                ToolTip.Tip="--staged"/>
+                ToolTip.Tip="--staged. If file is staged partically, the unstaged part of it will also be stashed."/>
 
       <CheckBox Grid.Row="3" Grid.Column="1"
                 Height="32"