wiki: add a recaptcha

extra/webapps/wiki/edit.xml

@@ -15,6 +15,10 @@
 			<t:field t:name="description" t:size="60" />
 		</p>
 
+		<p>
+			<t:recaptcha />
+		</p>
+
 		<p>
 			<button type="submit">Save</button>
 		</p>

extra/webapps/wiki/wiki.factor

@@ -9,6 +9,7 @@ http.server
 http.server.dispatchers
 furnace.actions
 furnace.utilities
+furnace.recaptcha
 furnace.redirection
 furnace.auth
 furnace.auth.login
@@ -169,6 +170,8 @@ M: revision feed-entry-url id>> revision-url ;
 : <submit-article-action> ( -- action )
     <action>
         [
+            validate-recaptcha
+
             validate-title
 
             {