Things to do

- Modify employees, Salary must be in pay_roll_items so it cant be moved when a employee is updated.
- Make employees javascript behavior
- Make greenhouses javascript behavior
- Change icons on the side nav bar
- Take off employees association from the create form to avoid confusions

- Translate assistances and pay_rolls module
- Add destroy nullify on permissions destroy and on roles destroy
- Filter/restrict menus by roles

- FIX ROLES TO HAVE MANY COMPANIES

- Added validates uniqueness of name in application product
- Added application product field validaions
- Added supplier field validations
- Added product application buy validacions
- Added application product sort by name in application product buy view