How to change pending approvals label text.

My question:
 I want to change the naming convention for approvals tab:
From the below fig: I want to modify the approvals, review and verification. Means i want to customize the words

I have tried this from process template, but still i did not find the edit option for these labels...



Please help me with this...
And is there any pre-condition available for approvals:
Like I want to send my work to verification first then review or (any condition). means without verification we should not be able to send our work to review or approval.