i18n: fix mistakes in translated strings

Fix typos and convert a question which does not expect to be replied
to a simple advice.

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

config.c

@@ -124,7 +124,7 @@ static const char include_depth_advice[] = N_(
 "	%s\n"
 "from\n"
 "	%s\n"
-"Do you have circular includes?");
+"This might be due to circular includes.");
 static int handle_path_include(const char *path, struct config_include_data *inc)
 {
 	int ret = 0;