message: Add missing interface text for great people rate modifier from culture
diff: <English>Can build %d1 National Wonders per City</English>
  <German>Kann pro Stadt %d1 Nationale Wunder errichten</German>
  </TEXT>
  + <TEXT>
  + <Tag>TXT_KEY_MISC_HELP_GREATPEOPLE_CULTURE_LEVEL</Tag>
  + <English>[ICON_BULLET]%D1%%[ICON_GREATPEOPLE] from Culture Level</English>
  + <German>[ICON_BULLET]%D1%%[ICON_GREATPEOPLE] durch Kulturstufe</German>
  + </TEXT>
  </Civ4GameText>
  