Make theme translatable

Hi,
a great many theme strings aren’t translatable. For example:

function sampression_readmore_link() {
	if(sampression_get_the_excerpt()) {
		$more = 'Read more';
		printf( '<div class="entry-footer"><a href="%2$s">%1$s</a></div>', $more, get_permalink() );
	}
}

It should be $more = __( 'Read more', 'sampression' );.
Please fix this. Thanks.