SubmittingPatches: advertise git-manpages-l10n project a bit

The project takes our AsciiDoc sources of documentation and actively
maintains the translations to various languages.

Let's give them enhanced visibility to help those who want to
volunteer find them.

Acked-by: Jean-Noël Avila <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

Documentation/SubmittingPatches

@@ -548,6 +548,13 @@ repositories.
 
 Patches to these parts should be based on their trees.
 
+- The "Git documentation translations" project, led by Jean-Noël
+  Avila, translates our documentation pages.  Their work products are
+  maintained separately from this project, not as part of our tree:
+
+	https://github.com/jnavila/git-manpages-l10n/
+
+
 [[patch-flow]]
 == An ideal patch flow