Use class translation for faction description and other translation updates

[Qrox]

Summary

SUMMARY: I18N "Use class translation for faction description and other translation updates"

Purpose of change

1. Use class translation for faction description for automatic text style checking.
2. Convert some old translator comments in json files to use extractable translator comments syntax.
3. Check for spaces after period and before end of string and fix reported strings.
4. Update the translation documentation.

Testing

Game loads, and no further issue was reported by the unit test.