localization: update spanish translations (#1279)

add missing translations

Author: jjesus-dev

src/Resources/Locales/es_ES.axaml

@@ -609,6 +609,7 @@
   <x:String x:Key="Text.Repository.Search" xml:space="preserve">Buscar Commit</x:String>
   <x:String x:Key="Text.Repository.Search.ByAuthor" xml:space="preserve">Autor</x:String>
   <x:String x:Key="Text.Repository.Search.ByCommitter" xml:space="preserve">Committer</x:String>
+  <x:String x:Key="Text.Repository.Search.ByContent" xml:space="preserve">Contenido</x:String>
   <x:String x:Key="Text.Repository.Search.ByFile" xml:space="preserve">Archivo</x:String>
   <x:String x:Key="Text.Repository.Search.ByMessage" xml:space="preserve">Mensaje</x:String>
   <x:String x:Key="Text.Repository.Search.BySHA" xml:space="preserve">SHA</x:String>