rename lock -> linked for clarity

ui/containers/options.js

@@ -144,7 +144,7 @@ class Options extends React.Component {
             </Form.Group>
 
             <Row className="ml-auto">
-              <Form.Check type="checkbox" onChange={this.props.lockToggle} checked={this.props.lockExposureBool === true} label="Lock" id="lock-check" />
+              <Form.Check type="checkbox" onChange={this.props.lockToggle} checked={this.props.lockExposureBool === true} label="Linked" id="lock-check" />
             </Row>
 
             <Form.Group as={Row}>