diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -827,10 +827,9 @@ class localrepository(repo.repository):
                 if match(s) and wctx.sub(s).dirty():
                     subs.append(s)
             if (subs or removedsubs):
-                # is hgsub modified and not included?
                 if (not match('.hgsub') and
                     '.hgsub' in (wctx.modified() + wctx.added())):
-                    raise util.Abort("can't commit subrepos without .hgsub")
+                    raise util.Abort(_("can't commit subrepos without .hgsub"))
                 if '.hgsubstate' not in changes[0]:
                     changes[0].insert(0, '.hgsubstate')