Fix #405: Feeds the title-ized taxonomy key through string replace to replace...

...the '-' with ' ' for proper display of the taxonomy title. 

`categories/basic-citizen-income/` listing page's title is now **Basic Citizen Income** instead of **Basic-Citizen-Income**.

I did not see a setting to configure the character used for space replacement so I hard-coded "-". If this is configurable, or should be, please let me know where I should be obtaining this value from for the string.Replace().