add edit thread routes

app/templates/threads/edit.html

@@ -0,0 +1,11 @@
+{%- from 'common/macros.html' import subheader, babycode_editor_component -%}
+{%- extends 'base.html' -%}
+{%- block title -%}editing thread "{{thread.title}}"{%- endblock -%}
+{%- block content -%}
+{{subheader('Rename thread "%s"' % thread.title, 'You can change the thread title here. To edit the OP of this thread, press the Edit button on the post instead.')}}
+<form class="plank primary-bg full-width" method="POST">
+  <label for="title">New title</label>
+  <input type="text" id="title" name="title" required value="{{thread.title}}">
+  <input type="submit" value="Save">
+</form>
+{%- endblock -%}

app/templates/threads/thread.html

@@ -22,7 +22,7 @@
   <legend>Actions</legend>
   {%- if is_logged_in() -%}
   {%- if thread.user_id == get_active_user().id -%}
-  <a class="linkbutton" href="{{url_for('threads.edit', thread_id=thread.id)}}">Edit</a>
+  <a class="linkbutton" href="{{url_for('threads.edit', thread_id=thread.id)}}">Rename</a>
   {%- endif -%}
   <form action="{{url_for('threads.subscribe' if not get_active_user().is_subscribed(thread.id) else 'threads.unsubscribe', thread_id=thread.id)}}" method="POST">
     <input type="hidden" name="last_post_timestamp" value="{{last_post.created_at}}">
@@ -37,7 +37,7 @@
 <fieldset class="plank even no-shadow minimal thread-actions">
   <legend>Moderation actions</legend>
   {%- if thread.user_id != get_active_user().id -%}
-  <a class="linkbutton warn" href="{{url_for('threads.edit', thread_id=thread.id)}}">Edit</a>
+  <a class="linkbutton warn" href="{{url_for('threads.edit', thread_id=thread.id)}}">Rename</a>
   {%- endif -%}
   <form method="POST">
     <input type="hidden" name="lock" value="{{(not thread.locked()) | int}}">