Delimiter of post type text is not localized

[lilyfan]

The comma delimiter of status text at "Right now" section in Dashboard is hard-coded.

To be able to localize the delimiter, use _c() function at line 107 of wp-admin/index.php below:

$post_type_text = implode(_c(', |post_type_text'), $post_type_texts);

The Right Now section is being overhauled to be more i18n friendly, making this patch unnecessary.