D11701: Add worksheet extension (.cws) to name of saved file, if user haven't added it youself.

[Alexander Semke]

asemke accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D11701

To: sirgienko, #cantor, asemke
Cc: asemke, #cantor, #kde_edu, narvaez, apol
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