To modify the text in the new self-service site from following file:
"C:\Program Files\One Identity\Password Manager\Web\SelfService\assets\i18n\en-US.json "
This file contains the messages for the English pages.
Changing line 78 will change the display test on the landing page on self-service site.
Open and modify the file using notepad, however make a backup of the file before modifying it.
After modification restart IIS as well as the Password Manager Service
Please see the attached screen shots.