Made amendments to Ukrainian (uk) localization.

Changed the way in which 'Last %weekday%' calendar dates are written by
making it more in line with modern grammar rules, added genitive case
for weekdays. Thus fixed an issue with displaying calendar dates as
'Last %weekday%', where nominative case was incorrectly used instead of
accusative.
Updated Ukrainian (uk) translation test according to latest changes.
Changed line endings in lang/uk.js back to follow UNIX convention.
Merge pull request #678 from TerraPass/fix-ukrainian-genitive

A fix for Ukrainian (uk) language translation