To customize a specific message on the portal, perform the following steps:
Click Custom Messages.
Use the Message filter to search for a specific message or you can find the preferred message manually.
Use the Message Group to search a specific message by group. Options available are All, Method messages, Error messages, and Other messages.
Click the Edit icon next to the preferred message. You can also double-click on the message to edit the content.
Specify the message in the preferred language.
Click Save.