Add ca-ES for localization
Updated quadtree tests to check the `nodes` property of the node (a d3_geom_quadtreeNode) instead of treating the node as an array (which it is not) and trying to check indexes within it. e.g. `node[2]`.
Merge pull request #1801 from jimkang/fix-quadtree-child-tests

Fix quadtree tests that check the children of a node
Merge pull request #1800 from rogerbramon/ca_ES-locale

Add ca-ES for localization
Automatically rewritten for npm.