Text: "By clicking "publish",All structured data from the file and property namespaces are available under the Creative Commons CC0 License. you agree to the terms of use,We need a message that states this clearly to users before they publish contributions. and you irrevocably agree to release your contribution under the Creative Commons CC0 License."Commons will use the same text that Wikidata uses because it has already been reviewed and approved by the legal department, and it's useful to have this kind of language be consistent across projects.
… and is shown on edit unless you permanently dismiss it by clickingText:
"By clicking "publish", you agree to the terms of use, and you irrevocably agree to release your contribution under the Creative Commons CC0 License." ... "I accept these terms for my future edits. Do not show this message again."
The above message will be shown on edit unless the user permanently dismiss it by accepting those terms.: