Media control don't allow button labels to be customized from the args array.

[chetanchauhan]

The code below doesn't work.

<?php
$wp_customize->add_control( new WP_Customize_Media_Control( $wp_customize, 'media_test', array(
                'label' => __( 'Example Media (audio) Control' ),
                'section' => 'title_tagline',
                'mime_type' => 'audio',
                'button_labels' => array(
                        'select'       => __( 'Select Audio' ),
                        'change'       => __( 'Change Audio' ),
                        'default'      => __( 'Default' ),
                        'remove'       => __( 'Remove' ),
                        'placeholder'  => __( 'No file selected' ),
                        'frame_title'  => __( 'Select Audio' ),
                        'frame_button' => __( 'Choose Audio' ),
                ),
        ) ) );

[chetanchauhan]

Allow media control button labels to be customized for each control seperately

[westonruter]

This has also been brought up by @celloexpressions at https://core.trac.wordpress.org/ticket/33755?replyto=102#comment:102

The button_labels parameter is supposed to be customizable, but I messed that up when I wrote the original WP_Customize_Media_Control and the new image control patches and I guess we never caught it. I added those to the control registration, so that element of the custom control is preserved (may not fully be working yet though - could use another set of eyes). This change is backwards compatible for subclasses that previously set button labels by overriding the whole array in a custom class constructor - that still works.

[celloexpressions]

Merge image control changes from #33755 with adjustment from ocean90.

[celloexpressions]

Good find @chetanchauhan, I'm surprised no one noticed this sooner.

35542.2.diff​ merges in my version from #33755 and the change suggested by ocean90 with the initial patch. This should be ready to commit.

[westonruter]

In 36769:

Customize: Allow button_labels to be overridden in $args passed to WP_Customize_Media_Control and WP_Customize_Image_Control.

Props chetanchauhan, celloexpressions.
See #33755.
Fixes #35542.