Fix various tooltip/text oversights.
This patch fixes some oversights missed in recent commits:
- pers.json entry in D2532/rP23746.
- brit.json entry in D2533/rP23781.
- Delete two auras rendered obsolete in D2686/rP23824.
- Tooltip and mace.json entry in D2867/rP23836.
- maur.json entry in D2821/rP23837.
- sele.json entry in D2858/rP23838.
- Indentation, tooltip, and {civ}.json entries in D2839/rP23840.
- Indentation, tooltip, and {civ}.json entries of Hellenistic Metropolis technology.
- Purged some non-existent things in various {civ.json} files.
- Added a history string and updated the technology tooltip for the Immortals.
- Fixed Cart walls civ bonus tooltip.
Patch by: Nescio
Reviewed By: borg-
Differential Revision: https://code.wildfiregames.com/D2885