fix: removed notification subheader translation string

public/language/en-GB/email.json

@@ -28,7 +28,6 @@
 	"reset.notify.text1": "We are notifying you that on %1, your password was changed successfully.",
 	"reset.notify.text2": "If you did not authorise this, please notify an administrator immediately.",
 
-	"digest.notifications": "You have unread notifications from %1:",
 	"digest.latest_topics": "Latest topics from %1",
 	"digest.cta": "Click here to visit %1",
 	"digest.unsub.info": "This digest was sent to you due to your subscription settings.",