Change "Merge when ready" text to "Enqueue" or "Add to merge queue"

[djeer]

I have a PR with all checks passing, but it shows "Merge when ready"

In other tools "Merge when ready" means "add to a queue when PR checks pass".

Here, it means "it will merge when it CI passes in the merge queue once you press this button enqueue it", which is a quite complex concept.

Can it be named "Add to a queue"?