A workaround for this problem would be installing kde-l10n-lt package perhaps – I have just updated to kde 4.6.3 from kubuntu ppa, and the problem went away, because this package from ppa was automatically installed.
I just checked and the package kde-l10n-lt (4:4.6.2-0ubuntu1) from natty main repositories does not have the above mentioned problem.
A workaround for this problem would be installing kde-l10n-lt package perhaps – I have just updated to kde 4.6.3 from kubuntu ppa, and the problem went away, because this package from ppa was automatically installed.
I just checked and the package kde-l10n-lt (4:4.6.2-0ubuntu1) from natty main repositories does not have the above mentioned problem.