jQuery( document ).ready( function ( $ ) {
if( $( '.product_type_variable.add_to_cart_button' )[0] ) {
$( '.product_type_variable.add_to_cart_button' ).text( 'Select models' )
}
if( $( '.single-product .variations #item-numbers option[value=""]' )[0] ) {
$( '.single-product .variations #item-numbers option[value=""]' ).text( 'Choose a model' )
}
} );