sysadmin reconstruct terms and conditions pages (#4231)

* sysadmin reconstruct terms and conditions pages

* update seafile-js version

* add term content dialog

* optimized code struct

* fix redirect logic after add term

* optimized code

* optimized code

* update seafile-editor version

frontend/src/components/dialog/terms-preview-dialog.js

@@ -0,0 +1,46 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Modal, ModalHeader, ModalBody } from 'reactstrap';
+import ConditionsPreviewWidget from './terms-preview-widget';
+import { gettext } from '../../utils/constants';
+
+const propTypes = {
+  title: PropTypes.string,
+  content: PropTypes.string,
+  onClosePreviewDialog: PropTypes.func.isRequired,
+};
+
+class TermsPreviewDialog extends React.Component {
+
+  static defaultProps = {
+    title: gettext('Terms'),
+    content: {text: '', perview: ''}
+  }
+
+
+  toggle = () => {
+    this.props.onClosePreviewDialog();
+  }
+
+  render() {
+    let { title, content } = this.props;
+    return (
+      <Modal
+        isOpen={true}
+        size={'lg'}
+        style={{width: 600}}
+        wrapClassName={'conditions-perview-wrapper'}
+        toggle={this.toggle}
+      >
+        <ModalHeader toggle={this.toggle}>{title}</ModalHeader>
+        <ModalBody>
+          <ConditionsPreviewWidget content={content} />
+        </ModalBody>
+      </Modal>
+    );
+  }
+}
+
+TermsPreviewDialog.propTypes = propTypes;
+
+export default TermsPreviewDialog;