Issue

Creating a menu item will set the label to "New Item" or "New Child".
Then, you have to edit the label manually once you set a page.

Solution

Menu item's label will now change to the assign page's one if:

• The label was "New Item" or "New Child"
• The label was empty

If it was anything else, it won't change.

Also, moved the default texts to menuUtils.js file as shared constants.

Potential issue:

If a user intentionally sets the label to exactly "New Item" or "New Child" and then picks an internal page, we'd still overwrite with page.label. That’s rare but possible.