Change Text in CRM Web Client UI (Search Dropdowns)

Hi is there a way to change the text within CRM Web Client UI....for the text that appears in dropdowns?

For example if I wanted to change the text from "Urgent Change" to "Emergency Change" where would I do this? The transaction type (ZMHF) has been updated with the correct text in the GUI but not sure how to update this particular section below.

Is this possible?

Thanks

Shaun