i18n: refactor "foo and bar are mutually exclusive"

Use static strings for constant parts of the sentences. They are all
turned into "cannot be used together".

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Reviewed-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/worktree.c b/builtin/worktree.c
index a396cfd..9a52048 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -699,7 +699,7 @@ static int list(int ac, const char **av, const char *prefix)
 	if (ac)
 		usage_with_options(worktree_usage, options);
 	else if (verbose && porcelain)
-		die(_("--verbose and --porcelain are mutually exclusive"));
+		die(_("options '%s' and '%s' cannot be used together"), "--verbose", "--porcelain");
 	else {
 		struct worktree **worktrees = get_worktrees();
 		int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;