i18n: commit: mark message for translation

Mark message commit_utf8_warn for translation.

Update tests to reflect changes.

Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/commit.c b/commit.c
index ba6dee3..8eb1707 100644
--- a/commit.c
+++ b/commit.c
@@ -1511,9 +1511,9 @@ static int verify_utf8(struct strbuf *buf)
 }
 
 static const char commit_utf8_warn[] =
-"Warning: commit message did not conform to UTF-8.\n"
-"You may want to amend it after fixing the message, or set the config\n"
-"variable i18n.commitencoding to the encoding your project uses.\n";
+N_("Warning: commit message did not conform to UTF-8.\n"
+   "You may want to amend it after fixing the message, or set the config\n"
+   "variable i18n.commitencoding to the encoding your project uses.\n");
 
 int commit_tree_extended(const char *msg, size_t msg_len,
 			 const unsigned char *tree,
@@ -1566,7 +1566,7 @@ int commit_tree_extended(const char *msg, size_t msg_len,
 
 	/* And check the encoding */
 	if (encoding_is_utf8 && !verify_utf8(&buffer))
-		fprintf(stderr, commit_utf8_warn);
+		fprintf(stderr, _(commit_utf8_warn));
 
 	if (sign_commit && do_sign_commit(&buffer, sign_commit))
 		return -1;