This page explains what each tag means.
Stub - This page certainly doesn't contain enough information to cover this topic and needs work.
Concept-todo - This was created a while ago. It means the page contains only concepts. It should be phased out.
Delete - These are pages that have been marked to be deleted pending confirmation. No one wants to lose a useful page.
Check - These pages may contain information that is out of date.
Working - These are pages that contain relevant information but parts of the topic have to be discussed properly.
Finalised - There is still a chance that it will need to be edited but are basically confirmed.
Partially - These pages have parts that have been implemented, but not totally.
Implemented - These things have already been implemented into the game and are unlikely to change.