minor UI changes

[Vishwas1]

• Change the field label Header (Optional) => Headers (Optional)
• Change the field label Condition => Match Condition
• Change select dropdown text Return Type in Condition => Response Type
• SEquence of the fields should be Title -> API Endpoint -> API Method -> Match Condition -> Headers (Optional) -> Score
• API Endpoint placeholder should be: http://yourdomain.com/api/path
• Change select dropdown text Return Type in Field type => Select Datatype
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