wp-includes/customize/class-wp-customize-media-control.php:221Get default button labels.
string[] public function get_default_button_labels() { // Get just the mime type and strip the mime subtype if present. $mime_type = ! empty( $this->mime_type ) ? strtok( ltrim( $this->mime_type, '/' ), '/' ) : 'default'; switch ( $mime_type ) { case 'video': return array( 'select' => __( 'Select video' ), 'change' => __( 'Change video' ), 'default' => __( 'Default' ), 'remove' => __( 'Remove' ), 'placeholder' => __( 'No video selected' ), 'frame_title' => __( 'Select video' ), 'frame_button' => __( 'Choose video' ), ); case 'audio': return array( 'select' => __( 'Select audio' ), 'change' => __( 'Change audio' ), 'default' => __( 'Default' ), 'remove' => __( 'Remove' ), 'placeholder' => __( 'No audio selected' ), 'frame_title' => __( 'Select audio' ), 'frame_button' => __( 'Choose audio' ), ); case 'image': return array( 'select' => __( 'Select image' ), 'site_icon' => __( 'Select Site Icon' ), 'change' => __( 'Change image' ), 'default' => __( 'Default' ), 'remove' => __( 'Remove' ), 'placeholder' => __( 'No image selected' ), 'frame_title' => __( 'Select image' ), 'frame_button' => __( 'Choose image' ), ); default: return array( 'select' => __( 'Select file' ), 'change' => __( 'Change file' ), 'default' => __( 'Default' ), 'remove' => __( 'Remove' ), 'placeholder' => __( 'No file selected' ), 'frame_title' => __( 'Select file' ), 'frame_button' => __( 'Choose file' ), ); } // End switch(). }Introduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.
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src/wp-includes/customize/class-wp-customize-media-control.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.