wp-ulike.php

<?php

// Add text/html before button
add_action( 'wp_ulike_before_template', function(){
	echo sprintf( '<span>%s</span>', __( 'Like me', 'wp-ulike' ) );
} );


// Add text/html after button
add_action( 'wp_ulike_after_template', function(){
	echo sprintf( '<span>%s</span>', __( 'Like me', 'wp-ulike' ) );
} );

Here is another example to limit to a specific type. (you can also use: comment, activity, topic values)

add_action( 'wp_ulike_after_template', function( $args ){
	if( $args['type'] === 'post' ){
		echo sprintf( '<span>%s</span>', __( 'Like me', 'wp-ulike' ) );
	}
} );