Parley: Documentation and l10n improves

[Antoni Bella Pérez]

  Hi everybody,

  I just make an MR (very big) for the Parley, if there is any developer/user 
interested I would appreciate your feedback.

<https://invent.kde.org/education/parley/-/merge_requests/17>

  They still miss renew many screenshots, but first I hope your approval.

Comment:
  BUG: Missing an action icon (from Breeze theme) in the toolbar: New Unit

  Regards
  Toni
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