ill be honest, im making a mod do replace all dialogue referencing you as an outsider / ashlander. Naturally, there's lots of dialogue to go through. I was hoping I could find it using something similar to Notepad++'s "ctrl + f" replace system.

Or perhaps there is an external program. Anyone able to help?

Well, you can export dialogue by going to File-->Export Data-->Dialogue and then import it back again. You could try that. For just doing a simple replace all, that might work.

You could also use tes3cmd. Here's an example script that replaces the word "Gold" with "Septims" in all dialogue:

tes3cmd modify --type INFO --sub-match "Response:" --replace /Gold/Septims/ Morrowind.esm

Just be warned that this is some pretty dangerous stuff which might net you unintended consequences. The above will, for example, also end up replacing dialogue like "Gold Kanet" with "Septims Kanet".

Then, make sure "MaintainImportedDialogueOrder=0" is set to 1 in morrowind.ini.