Translation of days of one letter

I was trying to translate some word of the events PO file.

I noticed that in the weekdays of one letter that appear in the calendar (S, M, T, W, F) there’s a little problem. In English Sunday and Saturday both begin with S, just like Tuesday and Thursday begin with T.

But in Spanish (or Italian) Sunday and Saturday begin with different letters (D and S), and I have only one option to changefor both in the PO file. The same happens with T (in Spanish M and J are used).

I solved this selecting two letters for each day in the widget to avoid duplicated letters for these days.

Thanks