For any app that won’t work on a Fairphone 2, for example Wordfeud, please try the following:
Go to “Privacy Impact”-Notifications: Settings / Sounds & Notifications / Privacy Impact / Uncheck the box.
Fairphone is working on this bug.
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Maybe a topic to be pinned? 
Great tip!
Now my Kiwix Wikipedia works again, thx!
This is a known bug and the topic exists already:
https://forum.fairphone.com/t/misbehaving-apps-fix-expected-for-next-update-workaround-re-enable-privacy-impact/11721?u=paulakreuzer&source_topic_id=12186