Adding a Spanish-Catalan JSON dictionary

This dictionary was created from the Apertium word list.
The tarball was downloaded from SourceForge:
http://sourceforge.net/projects/apertium/files/apertium-es-ca/1.2.1/

The dictionary file is apertium-es-ca.es-ca.dix.

The dix file was converted to JSON using a script by David Chan.

The license of Apertium is GPL 2.

Change-Id: I874e6d6951e26c7b30d45c6ca57e3042d4672144