WEBXID the glossary is like a document of commonly used terms, that a translator builds up. They can refer to the glossary in future chapters to increase the speed at which they translate a chapter of the novel at.
As for editing translated chapters, a translator has already translated future chapters, however, an editor needs to edit them to make it presentable to us.
They can't release it straight away because they need to build up a stockpile of chapters (60 iirc) before they can start releasing.