Add access key for save + next

Author: andrewgodwin

templates/_form.html

@@ -13,7 +13,7 @@
             <input class="button serious" type="submit" name="delete" value="{{ delete_verb|default:"Delete" }}">
         {% endif %}
         {% if include_random %}
-            <input class="button boring" type="submit" name="random_after" value="{{ random_verb|default:"Save & Next" }}">
+            <input class="button boring" type="submit" name="random_after" accesskey="n" value="{{ random_verb|default:"Save & Next" }}">
         {% endif %}
     </div>
 </form>