Add UI for admins to change preferred names

webclient/src/AdminMembers.js

@@ -360,6 +360,11 @@ export function AdminMemberForm(props) {
 					/>
 				</Form.Group>
 
+				<Form.Input
+					label='Preferred Name'
+					{...makeProps('preferred_name')}
+				/>
+
 				<Form.Input
 					label='Email'
 					{...makeProps('email')}