[clarity/consistency] rename /explorev2/ -> /explore/ (#2802)

* rename /explorev2/ -> /explore/

* add redirect for existing explorev2 urls

* fix long line

* remove extra line

* fix missed ref in spec

superset/assets/javascripts/explore/components/QueryAndSaveBtns.jsx

@@ -0,0 +1,81 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { ButtonGroup, OverlayTrigger, Tooltip } from 'react-bootstrap';
+import classnames from 'classnames';
+
+import Button from '../../components/Button';
+
+const propTypes = {
+  canAdd: PropTypes.string.isRequired,
+  onQuery: PropTypes.func.isRequired,
+  onSave: PropTypes.func,
+  onStop: PropTypes.func,
+  loading: PropTypes.bool,
+  errorMessage: PropTypes.node,
+};
+
+const defaultProps = {
+  onStop: () => {},
+  onSave: () => {},
+  disabled: false,
+};
+
+export default function QueryAndSaveBtns(
+  { canAdd, onQuery, onSave, onStop, loading, errorMessage }) {
+  const saveClasses = classnames({
+    'disabled disabledButton': canAdd !== 'True',
+  });
+  const qryButtonStyle = errorMessage ? 'danger' : 'primary';
+  const saveButtonDisabled = errorMessage ? true : loading;
+  const qryOrStopButton = loading ? (
+    <Button
+      onClick={onStop}
+      bsStyle="warning"
+    >
+      <i className="fa fa-stop-circle-o" /> Stop
+    </Button>
+  ) : (
+    <Button
+      className="query"
+      onClick={onQuery}
+      bsStyle={qryButtonStyle}
+      disabled={!!errorMessage}
+    >
+      <i className="fa fa-bolt" /> Query
+    </Button>
+  );
+
+  return (
+    <div>
+      <ButtonGroup className="query-and-save">
+        {qryOrStopButton}
+        <Button
+          className={saveClasses}
+          data-target="#save_modal"
+          data-toggle="modal"
+          disabled={saveButtonDisabled}
+          onClick={onSave}
+        >
+          <i className="fa fa-plus-circle" /> Save as
+        </Button>
+      </ButtonGroup>
+      {errorMessage &&
+        <span>
+          {' '}
+          <OverlayTrigger
+            placement="right"
+            overlay={
+              <Tooltip id={'query-error-tooltip'}>
+                {errorMessage}
+              </Tooltip>}
+          >
+            <i className="fa fa-exclamation-circle text-danger fa-lg" />
+          </OverlayTrigger>
+        </span>
+      }
+    </div>
+  );
+}
+
+QueryAndSaveBtns.propTypes = propTypes;
+QueryAndSaveBtns.defaultProps = defaultProps;