Add hint for ordergroup address in user form

app/views/shared/_user_form_fields.html.haml

@@ -13,7 +13,9 @@
 
 - if local_assigns[:with_address] && (f.object.ordergroup || f.object.new_record?)
   = f.fields_for [:ordergroup, f.object.ordergroup || Ordergroup.new] do |ogf|
-    = ogf.input :contact_address, label: t('activerecord.attributes.ordergroup.contact_address'), required: false
+    - address_hint = f.object.ordergroup.users.count > 1 ? t('.contact_address_hint') : nil
+    = ogf.input :contact_address, label: t('activerecord.attributes.ordergroup.contact_address'), required: false,
+                input_html: { title: address_hint, data: {toggle: 'tooltip', placement: 'right'} }
 
 = f.simple_fields_for :settings_attributes do |s|
   = s.simple_fields_for :profile, defaults: { inline_label: true } do |profile|

config/locales/en.yml

@@ -1423,6 +1423,8 @@ en:
       title: Current orders
       total_sum: Total sum
       who_ordered: Who ordered?
+    user_form_fields:
+      contact_address_hint: The address of your ordergroup. If you update this, it changes for other members of the ordergroup as well.
     workgroup_members:
       title: Group memberships
   simple_form: