Prevent from tabbing on tos and honor links

lms/templates/register.html

@@ -275,7 +275,7 @@
             <div class="field required checkbox" id="field-tos">
               <input id="tos-yes" type="checkbox" name="terms_of_service" value="true" required aria-required="true" />
               <label for="tos-yes">${_('I agree to the {link_start}Terms of Service{link_end}').format(
-                link_start='<a href="{url}" class="new-vp">'.format(url=marketing_link('TOS')),
+                link_start='<a href="{url}" class="new-vp" tabindex="-1">'.format(url=marketing_link('TOS')),
                 link_end='</a>')}</label>
             </div>
             % endif
@@ -291,7 +291,7 @@
                   honor_code_path = marketing_link('HONOR')
               %>
               <label for="honorcode-yes">${_('I agree to the {link_start}Honor Code{link_end}').format(
-                link_start='<a href="{url}" class="new-vp">'.format(url=honor_code_path),
+                link_start='<a href="{url}" class="new-vp" tabindex="-1">'.format(url=honor_code_path),
                 link_end='</a>')}</label>
             </div>
             % endif