i18n: remote: add comment for translators

Add comment drawing translator attention in order to align "Push
URL:" and "Fetch URL:" fields translation of git remote show output.

Aligning both fields makes the output more appealing and easier to
grasp.

Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/remote.c

@@ -1154,6 +1154,8 @@ static int show(int argc, const char **argv)
 			url_nr = states.remote->url_nr;
 		}
 		for (i = 0; i < url_nr; i++)
+			/* TRANSLATORS: the colon ':' should align with
+			   the one in "  Fetch URL: %s" translation */
 			printf_ln(_("  Push  URL: %s"), url[i]);
 		if (!i)
 			printf_ln(_("  Push  URL: %s"), "(no URL)");