I did an update for the catalan translation just for myself.
Working on Notepad++ v.5.5.1
if you want it,
you can download the catalan.xml file here:
The catalan download page for Notepad++ had undergone a number of additions, as it was quite outdated. Some of them involved automatic translation, and my knowledge of the language prevented me to spot all the resulting issues. If you wish to provide corrections for the page, please email me.