[i18n] Updated catalan translations.

[Carles Muñoz Gorriz]

* Po files for:
   - xfcalendar
   - xfce-mcs-manager
   - xfce-mcs-plugins
   - xfce4-iconbox
   - xfdesktop
   - xffm
   - xfprint
* Updated xfce4rc.ca (xfce4-panel)
   - Syncronized with xfce4rc
* Updated AUTHORS.html.ca (xfce-utils/xfce4-about)
   - Missed utf-8 meta tag.


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