Error in admin interface display

When using Content Access module together with ACL module and enabling per node content access, there is an error in admin interface which displays 3 categories of giving access to specific users.

It should be:

Grant View access

Grant Edit access

Grant Delete access

but due to an error in the code, it says for every row "Grant !op access".

There is an error in ContentAccessPageForm.php on line 76 where t() is written with a single quotation mark, and therefore the $op variable can't be used. This is an easy fix with adding double quotation marks and adding in the missing variable.