Only update a feed if it wasn't updated within the last five minutes

This will reduce load times when reloading the page very often (e.g.
during development)
Export messages as soon as possible

This way, if it crashes, the messages are likely to be visible to an error catching JSP
Implement error handling as suggested by issue #9
Translate starred
Rename the label 'all' to 'all entries'
Increase the height of the scroll pane again

This is crucial because it's necessary for Chrome to mark the oldest entry as read