Avoid an undefined index notice in WP_Widget_Recent_Posts::update(). props jrf. fixes #24577.

git-svn-id: http://core.svn.wordpress.org/trunk@24504 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove obsolete translator comment. props zeo. fixes #24464.

git-svn-id: http://core.svn.wordpress.org/trunk@24505 1a063a9b-81f0-0310-95a4-ce76da25c4cd