Add Catalan translation

[rbuj]

No description provided.

[codecov]

Codecov Report

Merging #336 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #336   +/-   ##
======================================
  Coverage    2.93%   2.93%           
======================================
  Files          36      36           
  Lines        2690    2690           
  Branches      358     358           
======================================
  Hits           79      79           
  Misses       2610    2610           
  Partials        1       1

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[coveralls]

Coverage remained the same at 1.78% when pulling 2dd3e40 on rbuj:ca-20171209 into 30af24a on IJHack:master.