add reusable babycode editor

views/common/babycode-editor.etlua

@@ -0,0 +1,16 @@
+<%
+  local save_button_text = "Post reply"
+  if cancel_url then
+    save_button_text = "Save"
+  end
+%>
+<form class="post-edit-form" method="post" action="<%= url or "" %>">
+  <% render ("views.common.babycode-editor-component", {ta_name = ta_name, prefill = prefill}) %>
+  <span>
+  <input type=submit value="<%= save_button_text %>">
+    <% if cancel_url then %>
+      <a class="linkbutton warn" href="<%= cancel_url %>">Cancel</a>
+    <% end %>
+  </span>
+  <% render("views.common.bbcode_help") %>
+</form>