Use before_validation callback to set child boolean.

This fixes issue where birthday is set to a date, then child is set to
'' or nil, erasing the correct value.
Call set_child on person so child attribute gets set.
Added the date picker strings to the pt.yml file. Also removed pt_rails.yml since it's not in use.
Merge pull request #244 from gustavobim/master

Added the date picker strings to the pt.yml file. Also removed pt_rails.yml
Move en.yml to en/general.yml
Merge pull request #245 from churchio/move-en-yml

Move en.yml to en/general.yml
Rename pt.yml too.