Add year to month labels on trend reports

[cielf]

Summary

Add the year to the month labels on trend reports

Why?

Bank request - reduce confusion

Details

There are 3 trend reports, accessible through the Reports menu (then donations - trend, purchases-trend, or distributions-trend). Bring up the report, then click an item or two to select them. You will see months along the horizontal axis of the graph. These months should have the appropriate year added ( a 2 digit year might be better than a 4 in this context, but use your judgement).

Criteria for completion

• years added as described above
• tests to support.

[Gabe-Torres]

I'll take this one!

[cielf]

It's yours!

[github-actions]

This issue is marked as stale due to no activity within 30 days. If no further activity is detected within 7 days, it will be unassigned.

[github-actions]

Automatically unassigned after 7 days of inactivity.