Given that custom reports can now have defined pagesize properties, we
need to preserve that value in the table filterset so that it's always
available after AJAX requests.
Reports can be viewed via two methods. Non-editing users can
access them via their report listing page, and report editors
can switch between editing and preview mode while working on
their reports.
Clean up remaining string definitions.
Co-authored-by: Mikel Martín <mikel@moodle.com>
Paul Holden