Fix wtforms validatoion of package name

app/templates/macros/topics.html

@@ -54,6 +54,7 @@
 		<li{% if topic.wip %} class="wiptopic"{% endif %}>
 			<a href="https://forum.minetest.net/viewtopic.php?t={{ topic.topic_id}}">{{ topic.title }}</a>
 			{% if topic.wip %}[WIP]{% endif %}
+			{% if topic.discarded %}[Old]{% endif %}
 			{% if topic.name %}[{{ topic.name }}]{% endif %}
 			{% if show_author %}
 				by <a href="{{ url_for('users.profile', username=topic.author.username) }}">{{ topic.author.display_name }}</a>

app/templates/packages/create_edit.html

@@ -50,7 +50,7 @@
 			{% if package and package.approved and not package.checkPerm(current_user, "CHANGE_NAME") %}
 				{{ render_field(form.name, class_="pkg_meta col-sm-3", readonly=True) }}
 			{% else %}
-				{{ render_field(form.name, class_="pkg_meta col-sm-3") }}
+				{{ render_field(form.name, class_="pkg_meta col-sm-3", pattern="[a-z0-9_]+", title=_("Lower case letters (a-z), digits (0-9), and underscores (_) only")) }}
 			{% endif %}
 			</div>
 			{{ render_field(form.short_desc, class_="pkg_meta") }}