Add direction tags to HTML e-mails for RTL languages (#6373)

app/helpers/application_helper.rb

@@ -22,10 +22,18 @@ module ApplicationHelper
   end
 
   def add_rtl_body_class(other_classes)
-    other_classes = "#{other_classes} rtl" if [:ar, :fa, :he].include?(I18n.locale)
+    other_classes = "#{other_classes} rtl" if locale_direction == 'rtl'
     other_classes
   end
 
+  def locale_direction
+    if [:ar, :fa, :he].include?(I18n.locale)
+      'rtl'
+    else
+      'ltr'
+    end
+  end
+
   def favicon_path
     env_suffix = Rails.env.production? ? '' : '-dev'
     "/favicon#{env_suffix}.ico"