Fix joining team dupe. Add loading to team member remove. Fix messages.

components/pages/settings/teams/TeamLeaveForm.js

@@ -0,0 +1,32 @@
+import { Button, Form, FormButtons, SubmitButton } from 'react-basics';
+import useApi from 'hooks/useApi';
+import useMessages from 'hooks/useMessages';
+
+export default function TeamLeaveForm({ teamUserId, teamName, onSave, onClose }) {
+  const { formatMessage, labels, messages, FormattedMessage } = useMessages();
+  const { del, useMutation } = useApi();
+  const { mutate, error, isLoading } = useMutation(data => del(`/teamUsers/${teamUserId}`, data));
+
+  const handleSubmit = async data => {
+    mutate(data, {
+      onSuccess: async () => {
+        onSave();
+        onClose();
+      },
+    });
+  };
+
+  return (
+    <Form onSubmit={handleSubmit} error={error}>
+      <p>
+        <FormattedMessage {...messages.leaveTeamWarning} values={{ name: <b>{teamName}</b> }} />
+      </p>
+      <FormButtons flex>
+        <SubmitButton variant="danger" disabled={isLoading}>
+          {formatMessage(labels.leave)}
+        </SubmitButton>
+        <Button onClick={onClose}>{formatMessage(labels.cancel)}</Button>
+      </FormButtons>
+    </Form>
+  );
+}