Add Catalan (Valencian) to KDocTools [MR #17]

[Antoni Bella Pérez]

  Hi,

  I open a MR for add Catalan (Valencian) support to documentation project.

  The discussion is opened in the MR:
<https://invent.kde.org/frameworks/kdoctools/-/merge_requests/17>

  Regards
  Toni
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