FEATURE: support user local switching to RTL correctly

FEATURE: support RTL in multisite

lib/sass/discourse_sass_compiler.rb

@@ -63,10 +63,8 @@ class DiscourseSassCompiler
       }
     }.merge(debug_opts)).render
 
-    # Check if CSS needs to be RTLed after compilation
-    # and run R2 gem on compiled CSS if true and R2 gem is available
     css_output = css
-    if !SiteSetting.allow_user_locale && SiteSetting.default_locale.in?(%w(he ar fa_IR))
+    if opts[:rtl]
       begin
         require 'r2'
         css_output = R2.r2(css) if defined?(R2)