i18n: git-push "prevent you from losing" message

Gettextize the "To prevent you from losing history" message. A test in
lib-httpd.sh and another in t5541-http-push.sh explicitly checked for
this message. Change them to skip under GETTEXT_POISON=YesPlease.
Signed-off-by: NÆvar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/push.c

@@ -129,9 +129,9 @@ static int push_with_options(struct transport *transport, int flags)
 		return 0;
 
 	if (nonfastforward && advice_push_nonfastforward) {
-		fprintf(stderr, "To prevent you from losing history, non-fast-forward updates were rejected\n"
+		fprintf(stderr, _("To prevent you from losing history, non-fast-forward updates were rejected\n"
 				"Merge the remote changes (e.g. 'git pull') before pushing again.  See the\n"
-				"'Note about fast-forwards' section of 'git push --help' for details.\n");
+				"'Note about fast-forwards' section of 'git push --help' for details.\n"));
 	}
 
 	return 1;

t/lib-httpd.sh

@@ -157,7 +157,7 @@ test_http_push_nonff() {
 		grep "^ ! \[rejected\][ ]*$BRANCH -> $BRANCH (non-fast-forward)$" output
 	'
 
-	test_expect_success 'non-fast-forward push shows help message' '
+	test_expect_success C_LOCALE_OUTPUT 'non-fast-forward push shows help message' '
 		grep "To prevent you from losing history, non-fast-forward updates were rejected" \
 			output
 	'

t/t5541-http-push.sh

@@ -128,11 +128,14 @@ test_expect_success 'push fails for non-fast-forward refs unmatched by remote he
 
 	# push master too; this ensures there is at least one '"'push'"' command to
 	# the remote helper and triggers interaction with the helper.
-	test_must_fail git push -v origin +master master:retsam >output 2>&1 &&
+	test_must_fail git push -v origin +master master:retsam >output 2>&1'
 
+test_expect_success 'push fails for non-fast-forward refs unmatched by remote helper: remote output' '
 	grep "^ + [a-f0-9]*\.\.\.[a-f0-9]* *master -> master (forced update)$" output &&
-	grep "^ ! \[rejected\] *master -> retsam (non-fast-forward)$" output &&
+	grep "^ ! \[rejected\] *master -> retsam (non-fast-forward)$" output
+'
 
+test_expect_success C_LOCALE_OUTPUT 'push fails for non-fast-forward refs unmatched by remote helper: our output' '
 	grep "To prevent you from losing history, non-fast-forward updates were rejected" \
 		output
 '