Fix ambiguous agenda view group label

I just noticed that in the Agenda side-bar, one of the group labels is ambiguous. One group is “Today”, but another one is named after the current weekday. For example, if today is Saturday and I have an appointment today and in one week, I see a “Today” group and a “Saturday” group. The problem with this is the “Saturday” group is ambiguous since today would be Saturday.

I suggest that this group be renamed to “In one week” or something else.