When we say ‘delivery information is available for 7 days’ you have to
infer _when_ the seven days starts. When you come back to the page it
still says ‘available for 7 days’ even if you only have a day left to
download it. This is confusing.
This commit changes the text to be relative to now, eg ‘available for 7
days’, ‘available for 1 day’.
The date is counted to midnight on the seventh day, which is when the
data is actually deleted.