Customize the title attributes of term links in the widget tag cloud

gistfile1.php

<?php
/**
 * Adds additional args to the widget tag cloud:
 *  format => array
 *  topic_count_text_callback => my_remove_default_tag_title
 *
 */
function my_add_type_arg( $args ) {
  $args['format'] = 'array';
	$args['topic_count_text_callback'] = 'my_remove_default_tag_title';

	return $args;
}
add_filter( 'widget_tag_cloud_args', 'my_add_type_arg' );

/**
 * Helper: Returns an empty string.
 */
function my_remove_default_tag_title() {
	return '';
}

/**
 * Generates the new term cloud.
 */
function my_tag_cloud( $tag_output, $tags, $args ) {
	// New title string, %s wil be replaced with the term name
	$title = 'Alle Beiträge zu %s ansehen';

	$i = 0;
	foreach ( $tag_output as $tag ) {
		// Check if we have a term id
	 	if ( preg_match( '/-link-(\d+)/', $tag, $match ) ) {
	 		// The term id
	 		$id = $match[1];

	 		// Get the name of the term
	 		$_title = sprintf(
	 			$title,
	 			get_term_field(
	 				'name',
	 				$id,
	 				$args['taxonomy'],
	 				'attribute'
	 			)
	 		);

	 		// Replace old title with the new one
	 		$_title = sprintf( 'title="%s"', $_title );
	 		$tag_output[ $i ] = str_replace(
	 			"title=''",
	 			$_title,
	 			$tag
	 		);
	 	}
	 	$i++;
	}

	// Build the term list
	$return = join( "\n", $tag_output );

	// Output
	echo $return;
}
add_filter( 'wp_generate_tag_cloud', 'my_tag_cloud', 10, 3 );