Minor updates for employee registry and rubrics management page

[jmcameron]

This PR implements some minor changes for the employee registry and the payroll rubrics management page.

• When editing an employee, the "Submit" button now reads "Update Employee" instead of "Register Employee"
• Fixed various English payroll-related terms (eg, "grapped" (saiser) should be changed to "entered")
• Add an Index type column to the Rubric management page (if using indexes). Hovering over the labels in these cells will bring up a tooltip describing them.

Closes #7206

This are just a few superficial fixes. The terminology (in English) for all payroll activities needs to be scrubbed.

[lomamech]

LGTM

[jmcameron]

bors r+

[bors]

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• ci/semaphoreci/push: Integration Tests