message: Add Austrian default name text
diff: <Plural>0:0:1:1</Plural>
  </Spanish>
  </TEXT>
  + <TEXT>
  + <Tag>TXT_KEY_CIV_AUSTRIA_DEFAULT</Tag>
  + <English>Archduchy of %s1</English>
  + </TEXT>
  <TEXT>
  <Tag>TXT_KEY_CIV_AUSTRIA_SHORT_DESC</Tag>
  <English>Austria</English>
  