Add Irish translator

THANKS

@@ -286,6 +286,7 @@ Rudolf Cornelissen <rag.cornelissen at inter.nl.net> - BeOS fixes
 Salar Khalilzadeh" <salarsoftwares@gmail.com> - Persian translation
 Sašo Kiselkov <skiselkov _at_ gmail dot com> - RTSP session timeout fix for some STBs, multipass x264 patch
 Scott Caudle <dorkmanzcot at gmail dot com> - Visualization, WX improvements
+Seanán Ó Coistín <seananoc at gmail dot com> - Irish translation
 Sebastian Jenny <jenny - sebastian &t gmail - com > - AAC decoding channel ordering fix.
 Sebastien Chaumat <Sebastien.Chaumat at ens-lyon.fr> - YOPY port tests
 Sebastien Zwickert (aka dilaroga) <dilaroga chez free> - Multiple Mac OS fixes and improvements