Support for subfiltering in JSON

[Former user]

Original issue 377 created by @ysavourel on 2013-11-14T19:33:08.000Z:

HTML embedded in JSON values is a thing that, unfortunately, happens.

This filter should support an option similar to the xmlstream filter to apply a subfilter to translatable content.

[Former user]

Comment 1. originally posted by @amake on 2013-11-28T13:04:15.000Z:

I have added subfiltering support in dev.

[Former user]

Comment 2. originally posted by @ysavourel on 2013-11-29T22:20:50.000Z:

Fixed with Aaron's changes.