hgweb: show revision number in the graph pagination

templates/coal/graph.tmpl

@@ -39,7 +39,7 files, or words in the commit message</s
 <div class="navigate">
 <a href="{url}graph/{uprev}{sessionvars%urlparameter}?revcount={revcountless}">less</a>
 <a href="{url}graph/{uprev}{sessionvars%urlparameter}?revcount={revcountmore}">more</a>
-| {changenav%navgraphentry}
+| rev {rev}: {changenav%navgraphentry}
 </div>
 
 <noscript>The revision graph only works with JavaScript-enabled browsers.</noscript>
@@ -104,7 +104,7 graph.render(data);
 <div class="navigate">
 <a href="{url}graph/{uprev}{sessionvars%urlparameter}?revcount={revcountless}">less</a>
 <a href="{url}graph/{uprev}{sessionvars%urlparameter}?revcount={revcountmore}">more</a>
-| {changenav%navgraphentry}
+| rev {rev}: {changenav%navgraphentry}
 </div>
 
 </div>