i18nalize snapshots/view_log

All of the copy for this section is contained in our en.yml
configuration file.

Change-Id: I6b4de4d60ee4071e817f58e7f326c9e65b382be0
i18nalize sweeps/index

I also noticed that this is the third time we are using the same exact
copy for time ago, so I moved it to a more global location.

Change-Id: I45eb70d72f3a94825a89a091cab55636e67dfbd6