Issue/252

@julen can you review this PR?
I'll add Monthly activity chart in a next commit to close issue #252.
Why is `Object()` necessary here at all?

If the last item of the object is for a default value, rather user `|| <defaultValue>`:
```
return {
  0: PTL.reports.user.rate,
  1: PTL.reports.user.review_rate,
  2: PTL.reports.user.hourly_rate,
}[taskType] || 0;
```