Rename "Edit Column" to "Column Details"

Summary: Ref T9089. This link leads to a detail page, not an edit page, and is always visible by users with permission to see the column.

Test Plan: Clicked "Column Details" with and without edit permission.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9089

Differential Revision: https://secure.phabricator.com/D14016