Thanks a lot for all the hints!
So just to double-check, to not mess up the wrong parameter, before I keep messing around with internals:
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My raspi-config is set to the profile
de_DE.UTF-8→ Ok from what I can see.
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In my openHAB "Regional Settings, the measurement system is set to “metric” and language is “English” → Ok from what I can see.
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In the karaf-console, as mentioned here, the reading
user.countryis the one I have to change as described in the post, if I want to keep openHAB’s language as “English” and the number formating with “.” as thousand separator. Correct?
user.country=US
user.dir=/openhab/userdata
user.home=/openhab
user.language=en
user.name=openhab
user.timezone=Europe/Berlin
Observation: Strangely I do not see any entries with something .format.

