Send a 0 value when a checkbox is unchecked
We can't sort by relation fields anymore
Improve translation handling
Fixes #677 - use FQN for "instanceof Model" expressions
Refs #679 - Fixed Visibility must be declared on property issues
Merge pull request #648 from Flynsarmy/checkboxZeroVal

Send a 0 value when a checkbox is unchecked
Use HTML to pass unchecked checkboxes/switches. Refs #648
Oops, broke the switch
Closes #673 - Add Argentine Spanish (es-AR) locale
Fixes #669 - Labels in filter do not translate