The same problem here in the Netherlands. For me it started in ios 10.3, so before iOS 11! I read everything about this subject, but no solution until 6 days ago .... a Dutch site about Apple, iCulture.nl, recently gave some possible solutions Sorry, only in Dutch. One of them was found in banking widgets.
I found THE solution in switching off the widget from my homebank, ING Bank.
I realise that most of you won’t have that particular widget, but finding, finally, a solid solution is great news.
My conclusion is that a mix of iOS and some Apple language in a widget causes all our frustrations.