Problem

Current KPIs are calculating the average task processing time per each role (translator, reviewer, translatorCheck) which is calculation by workflow-step type and it should be reflected in the UI more precisely.
Also we need to add analogous calculation for the actual workflow step.

Solution

1/ Correct the UI texts and the texts in the exported Excel so that they refer to what actually is calculated.
2/ Add calculation by workflow steps taking into account filters selected.