No, I am in the US. A comma cannot be entered.
This happens when trying to enter a numeric value with a decimal point into a Text input node set with a mode of "Number".
As can be seen by the popup tool tip it expects a whole number and displays the value in red.
Raspberry PI. Browser is on Windows 10 Enterprise using Edge (Chromium).
24 Aug 13:10:00 - [info] Node.js version: v12.18.3
24 Aug 13:10:00 - [info] Linux 5.4.51-v7l+ arm LE
24 Aug 13:10:00 - [info] Loading palette nodes
24 Aug 13:10:02 - [info] Dashboard version 2.23.2 started at /ui
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