Various changes and additions

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WDF/BA updates:


- GP004: Fixed the possibility to edit a menu when in View-only mode.


- Removed the browsertest from all applications, now that Internet Explorer is gone, and all browsers use up-to-date rendering engines.


- Email address verification via hunter.io updated.


- Filter column on empty value or zero: use a single minus character '-' to to show rows with no data in that column.