Fix passwords ending with + cannot match

Fix the UI password verifier and UI message in case the password ends with the "+" sign.

How to reproduce;
in WebUI, create a user and give it as password "test+" on the 2 lines:
The 2 passwords are said not to match.
"test+" and "test" match, according to the UI.

This also happens on the "change password" screen.

Request is to have a password verifier compatible with "+" as latest character.