summary: L10N messages hide clean-ness of workdir from 'hg summary'

'hg summary' recognizes workdir as clean by searching for 'clean' is
in own output text. But 'clean' is one of I18N target texts, so 'hg
summary --quiet' behaves incorrectly in non-English locale.

mercurial/commands.py

@@ -2949,6 +2949,7 b' def summary(ui, repo, **opts):'
             t.append(l % len(s))
 
     t = ', '.join(t)
+    cleanworkdir = False
 
     if len(parents) > 1:
         t += _(' (merge)')
@@ -2956,10 +2957,11 b' def summary(ui, repo, **opts):'
         t += _(' (new branch)')
     elif (not st[0] and not st[1] and not st[2]):
         t += _(' (clean)')
+        cleanworkdir = True
     elif pnode not in bheads:
         t += _(' (new branch head)')
 
-    if 'clean' in t:
+    if cleanworkdir:
         ui.status(_('commit: %s\n') % t.strip())
     else:
         ui.write(_('commit: %s\n') % t.strip())