How to replace the $title of one single page with a taxonomy term?
You can achievie that with contextual filters as well.

contextual filter: Content: Has taxonomy term ID

When the filter value is NOT available: 


provide default value -> type: Taxonomy term ID from URL
Load default filter from node page, that's good for related taxonomy
blocks
check the vocabulary which you want to use


When the filter value IS available or a default is provided:

Specify validation criteria -> PHP Code

$term = taxonomy_term_load($argument);
drupal_set_title($term-&gt;name);
return $argument;


It's done!