Add explanation for CW41, CW42, etc. date labels on yearly/all-time graphs

[stevennyman]

Apparently they stand for calendar week 41, calendar week 42, etc., but it wasn't fully clear what the labels meant before I looked them up. Perhaps it would make sense to show a non-abbreviated version of these labels and/or the date ranges they represent on hover?

[ihucos]

Makes sense. Any more concrete ideas how to display that? Hmm writing "Calendar Week" would overflow the graph.

[stevennyman]

Maybe as a tooltip when you hover on the bottom label or something?

[ihucos]

Yes, that might be a good idea, let's see if Chart.js supports it... thx