localization: add missing keys for zh_CN and zh_TW

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

Author: love-linger

src/Resources/Locales/en_US.axaml

@@ -250,13 +250,13 @@
   <x:String x:Key="Text.Diff.Binary.Old" xml:space="preserve">OLD</x:String>
   <x:String x:Key="Text.Diff.Copy" xml:space="preserve">Copy</x:String>
   <x:String x:Key="Text.Diff.FileModeChanged" xml:space="preserve">File Mode Changed</x:String>
+  <x:String x:Key="Text.Diff.First" xml:space="preserve">First Difference</x:String>
   <x:String x:Key="Text.Diff.IgnoreWhitespace" xml:space="preserve">Ignore Whitespace Change</x:String>
+  <x:String x:Key="Text.Diff.Last" xml:space="preserve">Last Difference</x:String>
   <x:String x:Key="Text.Diff.LFS" xml:space="preserve">LFS OBJECT CHANGE</x:String>
-  <x:String x:Key="Text.Diff.First" xml:space="preserve">First Difference</x:String>
   <x:String x:Key="Text.Diff.Next" xml:space="preserve">Next Difference</x:String>
   <x:String x:Key="Text.Diff.NoChange" xml:space="preserve">NO CHANGES OR ONLY EOL CHANGES</x:String>
   <x:String x:Key="Text.Diff.Prev" xml:space="preserve">Previous Difference</x:String>
-  <x:String x:Key="Text.Diff.Last" xml:space="preserve">Last Difference</x:String>
   <x:String x:Key="Text.Diff.SaveAsPatch" xml:space="preserve">Save as Patch</x:String>
   <x:String x:Key="Text.Diff.ShowHiddenSymbols" xml:space="preserve">Show hidden symbols</x:String>
   <x:String x:Key="Text.Diff.SideBySide" xml:space="preserve">Side-By-Side Diff</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -253,7 +253,9 @@
   <x:String x:Key="Text.Diff.Binary.Old" xml:space="preserve">原始大小</x:String>
   <x:String x:Key="Text.Diff.Copy" xml:space="preserve">复制</x:String>
   <x:String x:Key="Text.Diff.FileModeChanged" xml:space="preserve">文件权限已变化</x:String>
+  <x:String x:Key="Text.Diff.First" xml:space="preserve">首个差异</x:String>
   <x:String x:Key="Text.Diff.IgnoreWhitespace" xml:space="preserve">忽略空白符号变化</x:String>
+  <x:String x:Key="Text.Diff.Last" xml:space="preserve">最后一个差异</x:String>
   <x:String x:Key="Text.Diff.LFS" xml:space="preserve">LFS对象变更</x:String>
   <x:String x:Key="Text.Diff.Next" xml:space="preserve">下一个差异</x:String>
   <x:String x:Key="Text.Diff.NoChange" xml:space="preserve">没有变更或仅有换行符差异</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -253,7 +253,9 @@
   <x:String x:Key="Text.Diff.Binary.Old" xml:space="preserve">原始大小</x:String>
   <x:String x:Key="Text.Diff.Copy" xml:space="preserve">複製</x:String>
   <x:String x:Key="Text.Diff.FileModeChanged" xml:space="preserve">檔案權限已變更</x:String>
+  <x:String x:Key="Text.Diff.First" xml:space="preserve">第一個差異</x:String>
   <x:String x:Key="Text.Diff.IgnoreWhitespace" xml:space="preserve">忽略空白符號變化</x:String>
+  <x:String x:Key="Text.Diff.Last" xml:space="preserve">最後一個差異</x:String>
   <x:String x:Key="Text.Diff.LFS" xml:space="preserve">LFS 物件變更</x:String>
   <x:String x:Key="Text.Diff.Next" xml:space="preserve">下一個差異</x:String>
   <x:String x:Key="Text.Diff.NoChange" xml:space="preserve">沒有變更或僅有換行字元差異</x:String>