Commas in page atts panel

[oandregal]

The page attributes panel contains some weird commas:

[oandregal]

cc @jasmussen because you probably know how to tag this issue in a way that helps with issue visibility and such.

[oandregal]

Perhaps related to this (maybe some parsing error stripped them out and introduced the commas?): I cannot find where should I edit the parent page and the default template.

[oandregal]

Perhaps related #991

[karmatosed]

Thanks for reporting, good catch and this is previously reported and fixed in #3918.