it_CH/it_IT locales: Correct some LC_TIME formats (bug 10425).

Synchronize some values with CLDR and apply some suggestions from Bugzilla.

	[BZ #10425]
	* localedata/locales/it_IT (d_t_fmt): Use "%a %-d %b %Y, %T".
	(date_fmt): Use "%a %-d %b %Y, %T, %Z".
	* localedata/locales/it_CH (d_t_fmt): Use "%a %-d %b %Y, %T"
	which is the same as in it_IT.
	(d_fmt): Use "%d.%m.%Y" which is the same as in de_CH.
	(date_fmt): Use "%a %-d %b %Y, %T, %Z" which is the same as in it_IT.