Remove an outdate comment.
DecisionTree: Optionally load a JSON file containing translations.

For instance:
https://github.com/zooniverse/Galaxy-Zoo/blob/master/public/locales/es.json
Singleton: Look for a translation (.json) file for the current locale.

And pass it to the DecisionTree.
Add the .json translation files from the Galaxy-Zoo web site.

These are from
https://github.com/zooniverse/Galaxy-Zoo/tree/master/public/locales
They are licensed under the Apache License 2
https://github.com/zooniverse/Galaxy-Zoo/blob/master/license.txt
Apache License 2 code may be used in GPL3 projects (like this one)
http://www.apache.org/licenses/GPL-compatibility.html
(but not the other way around)

These file can then be found by the Singleton constructor.
See the previous commit.