message: Refactor stability texts
diff: <Tag>TXT_KEY_STABILITY_INSUFFICIENT_TRADE</Tag>
  <English>Economic Isolation</English>
  </TEXT>
  + <TEXT>
  + <Tag>TXT_KEY_STABILITY_ISOLATIONISM</Tag>
  + <English>Isolationism: no Cities outside of Core Area</English>
  + </TEXT>
  <TEXT>
  <Tag>TXT_KEY_STABILITY_LOSING_WARS</Tag>
  <English>Losing Wars</English>
  <Tag>TXT_KEY_STABILITY_LOST_TERRITORY</Tag>
  <English>We have lost control over our territory around %s1!</English>
  </TEXT>
  - <TEXT>
  - <Tag>TXT_KEY_STABILITY_ISOLATIONISM</Tag>
  - <English>Isolationism: no Cities outside of Core Area</English>
  - </TEXT>
  <TEXT>
  <Tag>TXT_KEY_STABILITY_MERCANTILISM_TRADE_RICHER</Tag>
  <English>Mercantilism: Trade with Wealthier Civilizations</English>
  