i18n: mark @{upstream} error messages for translation

Signed-off-by: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1_name.c

@@ -861,15 +861,15 @@ int interpret_branch_name(const char *name, struct strbuf *buf)
 	 * points to something different than a branch.
 	 */
 	if (!upstream)
-		return error("HEAD does not point to a branch");
+		return error(_("HEAD does not point to a branch"));
 	if (!upstream->merge || !upstream->merge[0]->dst) {
 		if (!ref_exists(upstream->refname))
-			return error("No such branch: '%s'", cp);
+			return error(_("No such branch: '%s'"), cp);
 		if (!upstream->merge)
-			return error("No upstream configured for branch '%s'",
+			return error(_("No upstream configured for branch '%s'"),
 				     upstream->name);
 		return error(
-			"Upstream branch '%s' not stored as a remote-tracking branch",
+			_("Upstream branch '%s' not stored as a remote-tracking branch"),
 			upstream->merge[0]->src);
 	}
 	free(cp);

t/t1507-rev-parse-upstream.sh

@@ -129,7 +129,7 @@ test_expect_success 'branch@{u} error message when no upstream' '
 	fatal: Needed a single revision
 	EOF
 	error_message non-tracking@{u} 2>actual &&
-	test_cmp expect actual
+	test_i18ncmp expect actual
 '
 
 test_expect_success '@{u} error message when no upstream' '
@@ -138,7 +138,7 @@ test_expect_success '@{u} error message when no upstream' '
 	fatal: Needed a single revision
 	EOF
 	test_must_fail git rev-parse --verify @{u} 2>actual &&
-	test_cmp expect actual
+	test_i18ncmp expect actual
 '
 
 test_expect_success 'branch@{u} error message with misspelt branch' '
@@ -147,7 +147,7 @@ test_expect_success 'branch@{u} error message with misspelt branch' '
 	fatal: Needed a single revision
 	EOF
 	error_message no-such-branch@{u} 2>actual &&
-	test_cmp expect actual
+	test_i18ncmp expect actual
 '
 
 test_expect_success '@{u} error message when not on a branch' '
@@ -157,7 +157,7 @@ test_expect_success '@{u} error message when not on a branch' '
 	EOF
 	git checkout HEAD^0 &&
 	test_must_fail git rev-parse --verify @{u} 2>actual &&
-	test_cmp expect actual
+	test_i18ncmp expect actual
 '
 
 test_expect_success 'branch@{u} error message if upstream branch not fetched' '
@@ -166,7 +166,7 @@ test_expect_success 'branch@{u} error message if upstream branch not fetched' '
 	fatal: Needed a single revision
 	EOF
 	error_message bad-upstream@{u} 2>actual &&
-	test_cmp expect actual
+	test_i18ncmp expect actual
 '
 
 test_expect_success 'pull works when tracking a local branch' '