Preferred language in management panel is only shown for SSO users

Due to a bug, it is not possible to see the language of external users.

    <% if @user.sso_profile.present? %>
      <tr>
        <td><strong><%= SsoProfile.human_attribute_name :netid %></strong></td>
        <td>
          <%= @user.netid %>
        </td>
      </tr>
      <% if @user.role_student? %>
        <tr>
          <td><strong><%= SsoProfile.human_attribute_name :student_number %></strong></td>
          <td>
            <%= @user.student_number %>
          </td>
        </tr>
        <tr>
          <td><strong><%= User.human_attribute_name :student_type %></strong></td>
          <td>
            <%= @user.human_student_type %>
          </td>
        </tr>
      <% end %>
      <tr>
        <td><strong><%= User.human_attribute_name :preferred_language %></strong></td>
        <td><%= human_locale @user.preferred_language %></td>
      </tr>
    <% end %>