bundle: Add colons to list headings in "verify"

These slightly improve the reading flow by making it obvious that a list
follows.

Also, make the wording of both headings consistent by changing "contains
%d ref(s)" to "contains this ref"/"contains these %d refs".

Signed-off-by: Lukas Fleischer <git@cryptocrack.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

bundle.c

@@ -183,8 +183,8 @@ int verify_bundle(struct bundle_header *header, int verbose)
 		struct ref_list *r;
 
 		r = &header->references;
-		printf_ln(Q_("The bundle contains %d ref",
+		printf_ln(Q_("The bundle contains this ref:",
-			     "The bundle contains %d refs",
+			     "The bundle contains these %d refs:",
 			     r->nr),
 			  r->nr);
 		list_refs(r, 0, NULL);
@@ -192,8 +192,8 @@ int verify_bundle(struct bundle_header *header, int verbose)
 		if (!r->nr) {
 			printf_ln(_("The bundle records a complete history."));
 		} else {
-			printf_ln(Q_("The bundle requires this ref",
+			printf_ln(Q_("The bundle requires this ref:",
-				     "The bundle requires these %d refs",
+				     "The bundle requires these %d refs:",
 				     r->nr),
 				  r->nr);
 			list_refs(r, 0, NULL);