help: replace underlining "help -a" headers using hyphens with a blank line

We used to underline a header text, like this:

    This is a header
    ----------------
    content...

But calculating text length so that the dashes align with the text
could get complicated because the text could be in any charset in
translated Git.

There is no point to use this pseudo underline; simply a blank
line would do and it even makes it easier to read:

    This is a header

    content...

While at it, give translators more context to translate, e.g.
e.g.  "git commands available..." instead of "%s available..."

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

builtin/help.c

@@ -425,7 +425,7 @@ int cmd_help(int argc, const char **argv, const char *prefix)
 
 	if (show_all) {
 		printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
-		list_commands(_("git commands"), &main_cmds, &other_cmds);
+		list_commands(&main_cmds, &other_cmds);
 		printf("%s\n", _(git_more_info_string));
 		return 0;
 	}

help.c

@@ -203,8 +203,7 @@ void load_command_list(const char *prefix,
 	exclude_cmds(other_cmds, main_cmds);
 }
 
-void list_commands(const char *title, struct cmdnames *main_cmds,
-		   struct cmdnames *other_cmds)
+void list_commands(struct cmdnames *main_cmds, struct cmdnames *other_cmds)
 {
 	int i, longest = 0;
 
@@ -217,23 +216,14 @@ void list_commands(const char *title, struct cmdnames *main_cmds,
 
 	if (main_cmds->cnt) {
 		const char *exec_path = git_exec_path();
-		printf_ln(_("available %s in '%s'"), title, exec_path);
-		/* TRANSLATORS: this must align with "available %s in '%s'" */
-		printf(_("----------------"));
-		mput_char('-', strlen(title) + strlen(exec_path));
+		printf_ln(_("available git commands in '%s'"), exec_path);
 		putchar('\n');
 		pretty_print_string_list(main_cmds, longest);
 		putchar('\n');
 	}
 
 	if (other_cmds->cnt) {
-		printf_ln(_("%s available from elsewhere on your $PATH"), title);
-		/* TRANSLATORS:
-		 * this must align with
-		 * "%s available from elsewhere on your $PATH"
-		 */
-		printf(_("---------------------------------------"));
-		mput_char('-', strlen(title));
+		printf_ln(_("git commands available from elsewhere on your $PATH"));
 		putchar('\n');
 		pretty_print_string_list(other_cmds, longest);
 		putchar('\n');

help.h

@@ -25,8 +25,7 @@ extern void add_cmdname(struct cmdnames *cmds, const char *name, int len);
 /* Here we require that excludes is a sorted list. */
 extern void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes);
 extern int is_in_cmdlist(struct cmdnames *cmds, const char *name);
-extern void list_commands(const char *title,
-			  struct cmdnames *main_cmds,
+extern void list_commands(struct cmdnames *main_cmds,
 			  struct cmdnames *other_cmds);
 
 #endif /* HELP_H */