fix csv download + template optional parameters

Conflicts:
	app/views/finance/financial_transactions/_transactions.html.haml
	app/views/home/ordergroup.html.haml
	app/views/login/_accept_invitation_form.html.haml

app/views/login/_accept_invitation_form.html.haml

@@ -0,0 +1,17 @@
+- content_for :javascript do
+  :javascript
+    $(#{FoodsoftConfig[:use_nick] ? 'user_nick' : 'user_first_name'}).focus();
+
+= (FoodsoftConfig[:invitation_form_message] or t('.body')).html_safe
+-# empty paragraph in case when invitation_form_text does not have <p></p>
+%p
+
+- form_url = local_assigns[:accept_invitation_path]
+= simple_form_for @user, url: form_url do |form|
+  - unless @invite and @invite.group
+    - capt = capture do
+      = form.fields_for :ordergroup do |ogf|
+        = ogf.input :contact_address, label: t('activerecord.attributes.ordergroup.contact_address'), required: false
+  = render partial: 'shared/user_form_fields', locals: {f: form, captured: capt}
+  .form-actions
+    = submit_tag t('.submit'), class: 'btn'