Adding support for new locale schema in preview

app/views/shared/_footer.html.haml

@@ -18,7 +18,7 @@
 			%ul
 				-I18n.backend.available_locales.each do |locale|
 					%li
-						%a{href: request.original_url.gsub(/^(https?:\/\/)(..\.)?(.*)$/, '\1' + locale + '.\3')}
+						%a{href: request.original_url.gsub(/^(https?:\/\/)(preview\-)?(..\.)?(.*)$/, '\1\2' + locale + '.\4')}
 							=_! locale.upcase
 						%span=I18n.t("languages.#{locale}", locale: locale, context: I18n.t("languages.#{locale}"))
 .copy