Create Person disability - how can we change the labels of the create form

Summary

Create Person disability - how can we change the labels of the create form

Content

Hello,

In the person disabilities screen,if you go to manage person - > disabilities tab  ,and choose the CREATE option ,

there is a screen called 'Create disability Information' - see screenshot please, 

How can we change the labels of 'Country', 'Category', 'Reason' - when i try to use a new sandbox, the 'Edit Pages' is not possible

from this screen.