Drupal 7 views contextual filter (taxonomy: summary display), displaying a readable term-name instead of term-id
Set your view to fields and expose the field that contains the associated taxonomy term.
Set your contextual filter to filter for a taxonomy term and select to include a validator.
Set the validator to taxonomy term and check the box for your vocabulary.
Select the option for filter value type as ' Term name converted to Term ID.
Save the filter and go to the preview box.  If you enter the text name of your term, you should see the desired content.


If you are passing the information from the URl you may have to select the 'Transform dashes in URL to spaces in term name filter values' checkbox as well since the machine name uses dashes