i18n: git-revert split up "could not revert/apply" message

Split up the "could not %s %s... %s" message into "could not revert
%s... %s" and "could not apply %s... %s". This makes it easier for
translators to understand the message.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/revert.c

@@ -536,8 +536,9 @@ static int do_pick_commit(void)
 	}
 
 	if (res) {
-		error("could not %s %s... %s",
-		      action == REVERT ? "revert" : "apply",
+		error(action == REVERT
+		      ? _("could not revert %s... %s")
+		      : _("could not apply %s... %s"),
 		      find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV),
 		      msg.subject);
 		print_advice();

t/t3507-cherry-pick-conflict.sh

@@ -38,7 +38,7 @@ test_expect_success 'failed cherry-pick does not advance HEAD' '
 	test "$head" = "$newhead"
 '
 
-test_expect_success 'advice from failed cherry-pick' "
+test_expect_success C_LOCALE_OUTPUT 'advice from failed cherry-pick' "
 	git checkout -f initial^0 &&
 	git read-tree -u --reset HEAD &&
 	git clean -d -f -f -q -x &&