i18n: notes: mark options for translation

Mark options description of git prune for translation.

Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/notes.c b/builtin/notes.c
index d11e6eb..0572051 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -934,8 +934,8 @@
 	struct notes_tree *t;
 	int show_only = 0, verbose = 0;
 	struct option options[] = {
-		OPT__DRY_RUN(&show_only, "do not remove, show only"),
-		OPT__VERBOSE(&verbose, "report pruned notes"),
+		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
+		OPT__VERBOSE(&verbose, N_("report pruned notes")),
 		OPT_END()
 	};