Enhance PO number prefix and suffix CRUD

Purpose: Improve the usability of PO prefix and suffix.

Acceptance criteria:
1)
Given the user is looking in PO number settings
When expanding the PO number Prefix and suffix accordion
Then they should see a separate controlled vocabulary list for each

2)
Given the controlled vocabulary list for prefix or suffix
When clicking new
Then the user should be able to define a prefix or suffix and add a description for it

3)
Given the controlled vocabulary list for prefix or suffix
When clicking new
Then the user should be able to define a prefix or suffix
AND a description for it
AND click save

4)
Given the controlled vocabulary list for prefix or suffix
When clicking delete for a certain prefix or suffix
Then that prefix or suffix should be removed from the list
Note: the prefix or suffix is stored in the PO number so if a user deletes a prefix or suffix it will not impact existing orders. However, it will no longer be available in the drop down