Admin Area's *Jobs* page is missing a column heading

Summary

When you view the Jobs list in the Admin Area, the details include a column featuring timing information. This column is not labelled, making it difficult for the user to interpret the data in that column.

Steps to reproduce

1. As an admin user, go to Admin Area > Jobs.

Note that the second-last column does not include a heading.

Example Project

Default local GDK installation.

What is the current bug behavior?

The Admin Area's Jobs page is missing a heading for the second-last column.

What is the expected correct behavior?

The Admin Area's Jobs page includes a heading for the second-last column.