WProofreader: Add ability to use company dictionaries

salmonek → changed the visibility of the branch 1.4.x to hidden.

Our QA team tested company dictionaries option. I have moved form element outside default settings as those are meant for Wproofreader widget settings available for editors.
Merged to 1.4.x and will be added in the next release.

Feature has been released in 1.4.1

Automatically closed - issue fixed for 2 weeks with no activity.