New translations en.xaml (Arabic)

[ci skip]

Author: jjw24

Flow.Launcher/Languages/ar.xaml

@@ -368,6 +368,7 @@
     <system:String x:Key="commonOK">حسناً</system:String>
     <system:String x:Key="commonYes">نعم</system:String>
     <system:String x:Key="commonNo">لا</system:String>
+    <system:String x:Key="commonBackground">الخلفية</system:String>
 
     <!--  Crash Reporter  -->
     <system:String x:Key="reportWindow_version">الإصدار</system:String>