Fix language and site creation

With the switch from Turbolinks to Turbo the redirect after submitting
the remote form inside the dialog stopped working. The resulting page
was rendered inside the dialog instead.

Using our own do_redirect_to method that gracefully handles JS
remote forms we can fix this.

app/controllers/alchemy/admin/languages_controller.rb

@@ -22,7 +22,7 @@ def create
         @language = Alchemy::Language.new(resource_params)
         if @language.save
           flash[:notice] = Alchemy.t("Language successfully created")
-          redirect_to alchemy.admin_pages_path(language_id: @language)
+          do_redirect_to alchemy.admin_pages_path(language_id: @language)
         else
           render :new
         end
@@ -48,7 +48,7 @@ def load_current_site
         @current_site = Alchemy::Site.current
         if @current_site.nil?
           flash[:warning] = Alchemy.t("Please create a site first.")
-          redirect_to admin_sites_path
+          do_redirect_to admin_sites_path
         end
       end
     end

app/controllers/alchemy/admin/sites_controller.rb

@@ -7,7 +7,7 @@ def create
         @site = Alchemy::Site.new(resource_params)
         if @site.save
           flash[:notice] = Alchemy.t("Please create a default language for this site.")
-          redirect_to alchemy.admin_languages_path(site_id: @site)
+          do_redirect_to alchemy.admin_languages_path(site_id: @site)
         else
           render :new
         end