[Parley] Replace deprecated libkeduvocdocument methods

Review Request #128256 - Created June 19, 2016 and submitted - Latest diff uploaded

Information
Hartmut Riesenbeck
parley
master
Reviewers
kdeedu

With commit ddb743b of libkeduvocdocument some methods which returned
non const refereces to private member values of KEduVocTranslation have
been set as deprecated. These methods were replaced with new provided
ones.

Some unused lines were deleted to make the compiling free of warnings.

Tested manualy.

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