content: sort tour translations links
content: sort tour translations links

Sorting by the latinized name of the language is a common choice
(wikipedia does that). Considering that at this point (we're on page
2) the user has already read some english text (page 1, with the
welcome, is in english), this shouldn't be too controversial or
unfriendly.

Change-Id: Id12be4e7bbae4099e98314256488a62f8da1ecd1
Reviewed-on: https://go-review.googlesource.com/93595
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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