kl_GL: Update the month names and date formats (bug 23740).

Month names as provided by Oqaasileriffik, the official Greenlandic
language regulator.  They have recently reached the consensus regarding
the orthography of the month names.

Date formats updated to match the correct Greenlandic order which is MDY.

	[BZ #23740]
	* localedata/locales/kl_GL (mon): Update, the relative case.
	(alt_mon): Add, fill with month names in the nominative case.
	(d_t_fmt): Set to "%a %b %d %Y %T %Z".
	(d_fmt): Set to "%b %d %Y".