New translations en.xaml (Vietnamese)

[ci skip]

Author: jjw24

Flow.Launcher/Languages/vi.xaml

@@ -372,6 +372,7 @@
     <system:String x:Key="commonOK">OK</system:String>
     <system:String x:Key="commonYes">Có</system:String>
     <system:String x:Key="commonNo">Không</system:String>
+    <system:String x:Key="commonBackground">Nền</system:String>
 
     <!--  Crash Reporter  -->
     <system:String x:Key="reportWindow_version">Phiên bản</system:String>