Refactor terms declined flash message to use a partial

This allows us to include a link in the flash message, without having
to use html_safe. Also refactor to avoid having html angle brackets in
the translation strings, while still allowing locale-specific urls.

app/controllers/users_controller.rb

@@ -42,7 +42,7 @@ class UsersController < ApplicationController
       if current_user
         current_user.terms_seen = true
 
-        flash[:notice] = t("users.new.terms declined", :url => t("users.new.terms declined url")).html_safe if current_user.save
+        flash[:notice] = { :partial => "users/terms_declined_flash" } if current_user.save
 
         if params[:referer]
           redirect_to safe_referer(params[:referer])

app/views/users/_terms_declined_flash.html.erb

@@ -0,0 +1 @@
+<%= t ".terms_declined_html", :terms_declined_link => link_to(t(".terms_declined_link"), t(".terms_declined_url")) %>

config/locales/en.yml

@@ -2334,8 +2334,6 @@ en:
       auth no password: "With third party authentication a password is not required, but some extra tools or server may still need one."
       continue: Sign Up
       terms accepted: "Thanks for accepting the new contributor terms!"
-      terms declined: "We are sorry that you have decided to not accept the new Contributor Terms. For more information, please see <a href=\"%{url}\">this wiki page</a>."
-      terms declined url: https://wiki.openstreetmap.org/wiki/Contributor_Terms_Declined
     terms:
       title: "Terms"
       heading: "Terms"
@@ -2358,6 +2356,10 @@ en:
         france: "France"
         italy: "Italy"
         rest_of_world: "Rest of the world"
+    terms_declined_flash:
+      terms_declined_html: We are sorry that you have decided to not accept the new Contributor Terms. For more information, please see %{terms_declined_link}.
+      terms_declined_link: this wiki page
+      terms_declined_url: https://wiki.openstreetmap.org/wiki/Contributor_Terms_Declined
     no_such_user:
       title: "No such user"
       heading: "The user %{user} does not exist"