20th (Victor Nikulshin) authored Nov 02, 2016 and Victor Nikulshin committed Nov 07, 2016

The `site_languages` parameter can receive multiple language codes separated by
commas. Thus its value cannot be reused as-is as a value of `locale` parameter
which is passed to Drush during site installation.

The value of `site_languages` must be split, and the first element in the list
of languages will be used as a site locale during installation.