[Small Ticket] Cross check number of sum messages in dashboard

[jmargutt]

Reported by HCD:

the sum of number of messages is wrong. If I take the month of January and February, it [country report] gives me a different amount then what is shows in trends
Yes, and 'trends of messages per category' is also wrong. We think it may help if we have 'validated' filter in the trends tab
We don't know the [present] date, but we need to present soon. But if the trends is not working yet, we can just show the dashboard, it is ok

[p-phung]

Fixed by using month-year of data to wire relationships between data tables