message: Songhai default dynamic name
diff: <Tag>TXT_KEY_CIV_SONGHAI_SHORT_DESC</Tag>
  <English>Songhai</English>
  </TEXT>
  + <TEXT>
  + <Tag>TXT_KEY_CIV_SONGHAI_DEFAULT</Tag>
  + <English>%s2 Empire</English>
  + </TEXT>
  <TEXT>
  <Tag>TXT_KEY_CIV_MALI_PEOPLES</Tag>
  <English>Mandinka Peoples</English>
  