i18n: mark init-db messages for translation

Mark the init-db messages that were added in v1.7.5-rc1~16^2 (init,
clone: support --separate-git-dir for .git file) by Nguyễn Thái Ngọc
Duy for translation.

This requires splitting up the tests that the patch added so that
certain parts of them can be skipped unless the C_LOCALE_OUTPUT
prerequisite is satisfied.

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

builtin/init-db.c

@@ -319,10 +319,10 @@ int set_git_dir_init(const char *git_dir, const char *real_git_dir,
 		struct stat st;
 
 		if (!exist_ok && !stat(git_dir, &st))
-			die("%s already exists", git_dir);
+			die(_("%s already exists"), git_dir);
 
 		if (!exist_ok && !stat(real_git_dir, &st))
-			die("%s already exists", real_git_dir);
+			die(_("%s already exists"), real_git_dir);
 
 		/*
 		 * make sure symlinks are resolved because we'll be
@@ -351,15 +351,15 @@ static void separate_git_dir(const char *git_dir)
 		else if (S_ISDIR(st.st_mode))
 			src = git_link;
 		else
-			die("unable to handle file type %d", st.st_mode);
+			die(_("unable to handle file type %d"), st.st_mode);
 
 		if (rename(src, git_dir))
-			die_errno("unable to move %s to %s", src, git_dir);
+			die_errno(_("unable to move %s to %s"), src, git_dir);
 	}
 
 	fp = fopen(git_link, "w");
 	if (!fp)
-		die("Could not create git link %s", git_link);
+		die(_("Could not create git link %s"), git_link);
 	fprintf(fp, "gitdir: %s\n", git_dir);
 	fclose(fp);
 }

t/t5601-clone.sh

@@ -194,11 +194,14 @@ test_expect_success 'do not respect url-encoding of non-url path' '
 test_expect_success 'clone separate gitdir' '
 	rm -rf dst &&
 	git clone --separate-git-dir realgitdir src dst &&
-	echo "gitdir: `pwd`/realgitdir" >expected &&
-	test_cmp expected dst/.git &&
 	test -d realgitdir/refs
 '
 
+test_expect_success C_LOCALE_OUTPUT 'clone separate gitdir: output' '
+	echo "gitdir: `pwd`/realgitdir" >expected &&
+	test_cmp expected dst/.git
+'
+
 test_expect_success 'clone separate gitdir where target already exists' '
 	rm -rf dst &&
 	test_must_fail git clone --separate-git-dir realgitdir src dst