Allow multiple groups in pb-login

[daliboris]

Current implementation allows only one group to be specified in pb-login component.

This change allows multple groups in pb-login, for example tei and quest.

Groups are separated items by space and/or punctuation.

This change doesn't break existing implementations.

[daliboris]

Yes, thank you.

I prefer a space and a comma because the value of the group property is displayed in the dialog when the login is not successful.

The warning message looks like a natural sentence if the groups are separated by a comma followed by a space.

[github-actions[bot]]

:tada: This PR is included in version 2.15.3 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: