verify: improve progress descriptions

For GUIs, the progress bar is disconnected visually from the text that
is output by ui.write(), so it's better to be a little bit redundant in
naming the status.  "checking" is redundant, since the user is running
the verify command.  'changesets', 'manifests', etc, tell the user what
is being checked (the entity being counted in the progress bar.

mercurial/verify.py

@@ -122,7 +122,7 b' def _verify(repo):'
     checklog(cl, "changelog", 0)
     total = len(repo)
     for i in repo:
-        ui.progress(_('checking'), i, total=total)
+        ui.progress(_('changesets'), i, total=total)
         n = cl.node(i)
         checkentry(cl, i, n, seen, [i], "changelog")
 
@@ -133,14 +133,14 b' def _verify(repo):'
                 filelinkrevs.setdefault(f, []).append(i)
         except Exception, inst:
             exc(i, _("unpacking changeset %s") % short(n), inst)
-    ui.progress(_('checking'), None)
+    ui.progress(_('changesets'), None)
 
     ui.status(_("checking manifests\n"))
     seen = {}
     checklog(mf, "manifest", 0)
     total = len(mf)
     for i in mf:
-        ui.progress(_('checking'), i, total=total)
+        ui.progress(_('manifests'), i, total=total)
         n = mf.node(i)
         lr = checkentry(mf, i, n, seen, mflinkrevs.get(n, []), "manifest")
         if n in mflinkrevs:
@@ -156,7 +156,7 b' def _verify(repo):'
                     filenodes.setdefault(f, {}).setdefault(fn, lr)
         except Exception, inst:
             exc(lr, _("reading manifest delta %s") % short(n), inst)
-    ui.progress(_('checking'), None)
+    ui.progress(_('manifests'), None)
 
     ui.status(_("crosschecking files in changesets and manifests\n"))