One more thing:
We renamed service pid / configuration pid for regional settings from org.eclipse.smarthome.core.i18nprovider (aka org.eclipse.smarthome.core.localeprovider) to org.eclipse.smarthome.i18n so that it is aligned with the standard pattern that we use, which is org.eclipse.smarthome.<configtype> (i.e. without “core” and also not using technical terms such as “provider”).
In general we have a powerful update script which e.g. can be used to move existing files to a different location. Unfortunately it seems not to work in some cases (see https://github.com/openhab/openhab-distro/issues/987) so that it might be possible for some of you to apply their regional settings again.
Here is one possible manual solution for it - linux shell based:
mv $OPENHAB_USERDATA/config/org/eclipse/smarthome/core/i18nprovider.config $OPENHAB_USERDATA/config/org/eclipse/smarthome/i18n.config
sed -i "s:org.eclipse.smarthome.core.i18nprovider:org.eclipse.smarthome.i18n:g" $OPENHAB_USERDATA/config/org/eclipse/smarthome/i18n.config