D18994: Update screenshots for Callibra 3.1

[Carl Schwan]

ognarb added reviewers: Calligra: 3.0, Documentation.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D18994

To: ognarb, #calligra:_3.0, #documentation
Cc: Calligra-Devel-list, kde-doc-english, gennad, dcaliste, skadinna, cochise, vandenoever
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