You can change the error messages to a text of your choice.
First, you should enable the Override error message option in your list settings to have the option to edit all the possible error messages.
- Go to your List, from the drop-down menu, click on Form settings.
- Enable the Override error messages option.
In The Validation Error Messages section, you can edit any error message you want.
Once done, click the Save button in the bottom right to save your changes.