Describe sage option in email select

'sage' is too esoteric for noobs. Ideally we should make this a checkbox because always noko but whatever

templates/post_form.html

@@ -40,7 +40,7 @@
 				{% if config.field_email_selectbox %}
 				<select name="email" id="email_selectbox" autocomplete="off">
 					<option value=""></option>
-					<option value="sage">sage</option>
+					<option value="sage">Don't bump thread</option>
 					{% if not config.always_noko %}<option value="noko">noko</option>{% endif %}
 				</select>
 				{% else %}