Make csv servlet work again.

The servlet needs additional improvements in generating correct files for all queries
Download csv via a standard link. Remove print button.

Print button code commented out because the print-fuction was sub-par.
It will be replaced with an image download at a later time.
Encode UITexts as UTF-8 to accomodate an intentional GWT bug

GWT uses a so-called "improved" properties format, which ignores
the official definition of how properties-files should be encoded.
This leads to problems in Eclipse, so we need to find a better solution.
Rename variable to use the word 'locale' instead of 'language'