Fixed JS-Charts X-Axis in members-statistics

Marthijn van den Nieuwenhuizen requested to merge statistic-names into master

Closes #950 (closed)

Previous behaviour

Steps to reproduce:

  1. open Statistics
  2. See missing statistic names on x-axis

New behaviour

Steps to validate that it works:

  1. op Statistics
  2. See no missing statistic names on x-axis

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