Configure two extra namespaces for zhwikisource

Adding the 'Translation' and 'Translation_talk'
namespaces (114 and 115, respectively) with two
aliases each; 114 should serve as a content
namespace and should be searched by default;
both namespaces should allow creating subpages.

See bug for details and a link to on-wiki
consensus for this change.

Bug: 64127
Change-Id: Ia1edac9ba1bb9d0e2ab9c8c88d302b957bc9850b
Merge "Configure two extra namespaces for zhwikisource"