Various bug fixes and improvements

Account details: Company data cannot be saved during a trial version. (RESOLVED)

General: New look and feel of the PDF viewer.

Check: Number of visible buttons adjusted according to screen width.

Check: Last updated is now visible in the ‘Update master data’ button.

Home: The total count at the bottom of the ‘Backlog per administration’ table is now clickable and leads to All documents to be processed.