You can create or edit the list of your quick links in your user preferences.

[DIFF]

marks older pages that have at least one backup version stored (click for an author diff)

[UPDATED]

marks pages edited since you set your bookmark (click for a bookmark diff)

[NEW]

marks pages created since you set your bookmark, and were not edited after creation

[DELETED]

marks page deletions

[RENAMED]

marks page renames

[CONFLICT]

An editing conflict happened, please resolve it by merging both versions of the problematic paragraphs together.