Bug 13373 [2/2] - Update Polish web installer sample data files.

Bug 13373 [2/2] - Update Polish web installer sample data files.

Part 2/2 - optional files.

Changes:
- Deleted unnecessary files
- Translated description files and some values in sql files

To test:
- Aplly patch
- Run webinstaller on empty database (drop database and create new if necessary)
- Verify everything works, especially verify you have permission
to all modules, eg. Tools, Catalouging etc.
- Check spelling and grammar if you can :)

Signed-off-by: Chris <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit af148f92b492aeea01119a9e7db15ebffcbb4517)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>