Hello POTP -
Unfortunately no, we would not be able to do so for you.
There is a bulk tool available in the Advanced Edit for Saved listings that will allow you to make changes to the Description as a Find and Replace, but please keep in mind that the tool does require the related HTML for any text you are changing, and, depending on the size of your descriptions, the tool may not be able to accommodate an entire description in one pass.
Apologies for any inconvenience this may cause.
- Craig