User-IDs with umlauts seem to be used in some installations. We added one new configuration
options to handle those User-IDs. The default is now that multisite replaces the umlauts
ü, ö, ä, ß with two letters ue, oe, ae, ss. Other umlauts are left untouched. Another option
is that users with umlauts are simply skipped and not synced into multisite.
Please note: Users with umlauts need to login with their umlaut login name. After login, the
username is always used without umlauts within multisite.
Maybe we make multisite handle umlauts correctly one day, but for the moment this change
could have too many unwanted results.
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