Author: David Mudrak
MDL-26914 When installing a lang pack, install all the grandparents too
All places where a language pack is installed now use the new language
package installer that takes case of the parental dependencies.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=74a4c9a9ee7fb1ae67d27c0a8aed00a653c47967
http://github.com/moodle/moodle/commit/74a4c9a9ee7fb1ae67d27c0a8aed00a653c47967
+ 2.1dev en [langpackuptodate,core_admin]