fix: Fixes email body when sharing a chart by email (#14664)

(cherry picked from commit 32f5f365d8635851a39b299b2ce6c319a839cade)
diff --git a/superset-frontend/src/dashboard/components/SliceHeaderControls/index.jsx b/superset-frontend/src/dashboard/components/SliceHeaderControls/index.jsx
index 422e915..daea11a 100644
--- a/superset-frontend/src/dashboard/components/SliceHeaderControls/index.jsx
+++ b/superset-frontend/src/dashboard/components/SliceHeaderControls/index.jsx
@@ -266,6 +266,7 @@
             copyMenuItemTitle={t('Copy chart URL')}
             emailMenuItemTitle={t('Share chart by email')}
             emailSubject={t('Superset chart')}
+            emailBody={t('Check out this chart: ')}
             addSuccessToast={addSuccessToast}
             addDangerToast={addDangerToast}
           />