Add sort filter in 'Modern' template
Fix default value for sort in templates/elegant/filters.tpl

It was used wrong smarty variable. Sort was reseted to Title (even while
changing page) while it should keep last chosen value.
Show sort filter in "Elegant" template only if sort is turn on

Sort filter should be displayed only if it's smarty variable is set i.e.
"Order by DiskID" in config is turned off. If "Order by DiskID" is turn
on, sorting is turn off, smarty variable order $order_options is empty
and filter select box is just empty select.
Sort filter in "Default template"
Update Polish translation

- Convert from ISO-8859-2 to UTF-8
- Add missing translation
- Format to match exactly language/en.php for easier update in future
Merge pull request #57 from mboczek/patch_sort

Patches to sort views in templates and polish translation