[TECH SUPPORT] LPS-36368 Replacing URLs during export and import in content

Hi Brian,

This is a support fix, I've assisted @akosthurzo from the very beginning to provide this solution. This PR does not contain a test for the fix itself, because the support needs this for the customer, but I'm going to help Ákos to implement one, because this is something we definitely need to test. This will come later.

Thanks,

Máté