How translations review process works?

Question: How can I/someone review the translations made in Launchapad for Ubuntu ?

Answer: Reviewing is mostly about exactly that "re-viewing".

If you think the translation is good, and other sugestions are no longer useful, then just check the mark "Confirm this translation and dismiss all suggestions" .

If you are not sure about a translation you have just made, you can check the mark: "Someone should review this translation" and your translation will be listed as "Needs review".
Usually the one who translated a string would ask for reviewing as he/she might have considered the translation to be only half-good or is not sure about the current version.