pretty.c: better die message %(count) and %(total)

Improve die messages for commands that do not support %(count) and
%(total)

Signed-off-by: Mirko Faina <mroik@delayed.space>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: Mroik

pretty.c

@@ -1551,15 +1551,15 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 
 	if (starts_with(placeholder, "(count)")) {
 		if (!c->pretty_ctx->rev)
-			die(_("this format specifier can't be used with this command"));
+			die(_("%s is not supported by this command"), "%(count)");
 		strbuf_addf(sb, "%0*d", decimal_width(c->pretty_ctx->rev->total),
 			    c->pretty_ctx->rev->nr);
 		return 7;
 	}
 
 	if (starts_with(placeholder, "(total)")) {
 		if (!c->pretty_ctx->rev)
-			die(_("this format specifier can't be used with this command"));
+			die(_("%s is not supported by this command"), "%(total)");
 		strbuf_addf(sb, "%d", c->pretty_ctx->rev->total);
 		return 7;
 	}