Here are some friendly and clever ways to inform users their comment is pending approval:

1. "Your comment is in the queue! We'll give it a quick once-over before it joins the conversation."

2. "Comment submitted! Just waiting for our friendly neighborhood moderator to wave it through."

3. "Your thoughts are on deck! We're giving them a quick polish before they shine for everyone."

4. "Message received! Our content concierge is preparing your comment for display."

5. "Thanks for sharing! Your comment is getting VIP treatment before its big debut."

6. "Hold tight! Your words are getting a quick safety check before joining the party."

7. "Comment successfully caught! Just letting it marinate in our moderation queue for a moment."

8. "Your voice matters to us! We're just making sure everything's shipshape before it goes live."

9. "Nice one! We're giving your comment a quick high-five before it joins the conversation."

10. "Message in a bottle sent! Our moderation crew will fish it out shortly."

Would you like me to implement one of these as a UI notification in your project?

The sentence is grammatically correct, but here's a slightly more polished version with a small improvement:

"Comment submitted! Just waiting for the moderator to wave it through. Please don't resubmit."

Changes made:

1. Added "the" before "moderator" (more natural)
2. Changed "do not" to "don't" (more conversational)
3. Removed "it" at the end (redundant since we're talking about the comment)

The original is perfectly understandable, but this version flows slightly better while keeping the same friendly tone.