Rename State Cost Category page and update Nav Bar to better assist users in navigation

[thetif]

Change log -

• Change nav label to State staff and expenses (from State cost categories)
• Change page header to State staff and expenses (from State cost categories)
• Change the FFP and Budget > Estimated Quarterly budget table first row to
  State Staff and Expenses
  (In-house Costs) (would be ideal for this to be on its own line for clarity)

Make sure the export view reflects the recent changes to the headers:

• Change "In-House Cost Categories: State Personnel" to
  Correct "State staff"
• Change "In-House Cost Categories: Non-Personnel" to
  Correct "Other state expenses"

Original design task #2390

This task is done when...

• the navigation is updated according to the above
• the builder is updated according to the above
• the exporter is updated according to the above