Rephrase text based on code review
(cherry picked from commit bc1628378dfa54061d4156429668a7dc1b81f478)
Fixes multiple runtimes in mutiny mode.

Example runtime:

runtime error: Cannot read null.assigned_role
proc name: get crew to terminate (/datum/directive/terminations/financial_crisis/get_crew_to_terminate)
  source file: financial_crisis_directive.dm,11
  usr: null
  src: /datum/directive/terminations/... (/datum/directive/terminations/financial_crisis)
  call stack:
/datum/directive/terminations/... (/datum/directive/terminations/financial_crisis): get crew to terminate()
/datum/directive/terminations/... (/datum/directive/terminations/financial_crisis): meets prerequisites()
mutiny (/datum/game_mode/mutiny): get directive candidates()
mutiny (/datum/game_mode/mutiny): pre setup()
/datum/controller/gameticker (/datum/controller/gameticker): setup()
/datum/controller/gameticker (/datum/controller/gameticker): pregame()
/datum/controller/game_control... (/datum/controller/game_controller): setup()

(cherry picked from commit 8810d3db7138e2c8868ec2a38d490840255df1df)
Changed Mutiny messages to use the existing Centcomm message format.

(cherry picked from commit 65c0dc2e64b810e03553d2646df8a9c4502888e0)
Cleans up some of the lore issues with Mutiny.

(cherry picked from commit 4f73f7a834a9780b839694950fb832a5340fd4c0)
Missed a linebreak.

(cherry picked from commit 8b65aa727be7b729af7644201ab64380255edc45)
Attempts to ensure that the captain (or the head loyalist to be precise, whomever he might be) is not a candidate for the directives.

(cherry picked from commit fc5d33917b70e1ea49488e8d7746008ff6fd843c)