Remove title attribute and shorten title

functions.php

<?php
// Add this function to your functions.php file or to your functions plugin.
function posts_in_sidebar_hacks() {
	wp_enqueue_script( 'pis-add-hacks', get_template_directory_uri() . '/js/pis-hacks.js', array( 'jquery' ), false, true );
}
add_action( 'wp_enqueue_scripts', 'posts_in_sidebar_hacks' );

pis-hacks.js

jQuery(document).ready(function(){
	// Remove the title attribute from all links with "pis-thumbnail-link" class.
	jQuery('a.pis-thumbnail-link').removeAttr("title");
	// Shorten all links with "pis-title-link" class to 9 characters if they are longer than 10 characters.
	jQuery('a.pis-title-link').each(function(){
		var str = jQuery(this).text();
		str = str.trim(str);
		if (str.length > 10) {
			jQuery(this).text(str.substr(0, 9));
			jQuery(this).append('…');
		}
	});
});