app/views/account/index_anonymous.html.erb
<h1><%= _('Identify yourself') %></h1>
<p>
<%= modal_link_to _('Login.'), { :controller => 'account', :action => 'login_popup' } %>
<%= _('You need to login to be able to use all the features in this environment.') %>
</p>
<p>
<%= link_to _('Sign up.'), :action => 'signup' %>
<%= _('If you are not an user already, you can register now to become a member of this environment.') %>
</p>