Added localization to workshops, made login persist through subdomains

app/views/shared/_footer.html.haml

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

app/views/shared/_navbar.html.haml

@@ -9,11 +9,11 @@
 				= nav_link about_path, (_'page_titles.About_BikeBike')
 				= nav_link policy_path, (_'page_titles.Safe_Space_Policy')
 			.actions
-				- if @conference.registration_open
+				- if @conference && @conference.registration_open
 					- if params[:action] != 'register' && !@registration
 						= link_to register_path(@conference.slug), class: [:button, :register] do
 							=_'conference.actions.Register'
-				- else
+				- elsif @conference
 					= render 'shared/donate_button', :email_address => (@conference.paypal_email_address || @conference.email_address)
 				- if current_user
 					= form_tag :logout, class: :logout do