alias.c: mark split_cmdline_strerror() strings for translation

This function can be part of translated messages. To make sure we
don't have a sentence with mixed languages, mark the strings for
translation, but only use translated strings in places we know we will
output translated strings.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

alias.c

diff --git a/alias.c b/alias.c
index a7e4e57..c471538 100644
--- a/alias.c
+++ b/alias.c
@@ -47,8 +47,8 @@ void list_aliases(struct string_list *list)
 #define SPLIT_CMDLINE_BAD_ENDING 1
 #define SPLIT_CMDLINE_UNCLOSED_QUOTE 2
 static const char *split_cmdline_errors[] = {
-	"cmdline ends with \\",
-	"unclosed quote"
+	N_("cmdline ends with \\"),
+	N_("unclosed quote")
 };
 
 int split_cmdline(char *cmdline, const char ***argv)

builtin/merge.c

diff --git a/builtin/merge.c b/builtin/merge.c
index 4aa6071..92ba7e1 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -577,7 +577,7 @@ static void parse_branch_merge_options(char *bmo)
 	argc = split_cmdline(bmo, &argv);
 	if (argc < 0)
 		die(_("Bad branch.%s.mergeoptions string: %s"), branch,
-		    split_cmdline_strerror(argc));
+		    _(split_cmdline_strerror(argc)));
 	REALLOC_ARRAY(argv, argc + 2);
 	MOVE_ARRAY(argv + 1, argv, argc + 1);
 	argc++;

git.c

diff --git a/git.c b/git.c
index 5fd30da..c7e122c 100644
--- a/git.c
+++ b/git.c
@@ -344,7 +344,7 @@ static int handle_alias(int *argcp, const char ***argv)
 		count = split_cmdline(alias_string, &new_argv);
 		if (count < 0)
 			die(_("bad alias.%s string: %s"), alias_command,
-			    split_cmdline_strerror(count));
+			    _(split_cmdline_strerror(count)));
 		option_count = handle_options(&new_argv, &count, &envchanged);
 		if (envchanged)
 			die(_("alias '%s' changes environment variables.\n"