tour: add link to Bahasa Indonesia translation.
tour: add link to Bahasa Indonesia translation.

Change-Id: I6082947d86850b97fa04e076e917ff6524abfbf8
Reviewed-on: https://go-review.googlesource.com/15017
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

zorion/go-tour-ca,golians/tour,shuLhan/tour,shuLhan/go-tour-id,Go-zh/tour,zorion/go-tour-ca,golang/tour,scryner/tour,dupoxy/go-tour-fr,shuLhan/go-tour-id,golians/tour,dupoxy/go-tour-fr,golians/tour,Go-zh/tour,shuLhan/tour,scryner/tour,scryner/tour,shuLhan/tour,scryner/tour,dupoxy/go-tour-fr,Go-zh/tour,shuLhan/go-tour-id,Go-zh/tour