Set max-age to 2419200 (one month) for action=ulslocalization API calls

I specified one year as the desirable value on the bug, but one month is
probably saner since we're still hammering out the details of how to deliver
this data.

Bug: 56509
Change-Id: I4e3664f953e25b2c01b9c1f75d3aa27ef7e3af4f