Fix localization issues when a plugin calls wp_enqueue_script() too early

[nacin]

Follow-up to #11526. After digging through this some more, the attached change to WP_Scripts should be just fine for all locales.

[nacin]

This doesn't work, but I bet there is a solution at hand.

[SergeyBiryukov]

Seems to work in my test with ticket:14024:doing-it-wrong.php​.

[azaozz]

Thinking it would make sense to run that action early on "init":

add_action( 'init', array( $this, 'init' ), 1 ); 

[nacin]

Works fine with the test, but fails when nothing is attached too early. This is because we're already at the init hook by the time we try to attach something to init.

[nacin]

In [19865]:

Wait until init to fire wp_default_scripts. Fixes localization issues when a plugin calls wp_enqueue_script() too early (in spite of the _doing_it_wrong warning signs added in #11526). fixes #19959.

[nacin]

In [19872]:

Coverage for load-scripts.php. fixes #19959.