Public bug reported:

Hope this is the right package and not glibc: Got a bug report for
wxMaxima that Umlaute ("öäüÄÖÜß") aren't treated as ordinary letters
anymore. As wxMaxima uses the isalpha() command in order to see if
something is a letter and since wxMaxima uses utf8 that meant that
isalpha() doesn't recognize an unicode umlaut as letter anymore. Which
solved my problem: ispell.el in emacs currently divides words at any
umlaut.

LC_CTYPE seems to be set correctly, though:

gunter@marius:~$ locale
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_CTYPE=de_DE.UTF-8
LC_NUMERIC=de_DE.UTF-8
LC_TIME=de_DE.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=de_DE.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=de_DE.UTF-8
LC_NAME=de_DE.UTF-8
LC_ADDRESS=de_DE.UTF-8
LC_TELEPHONE=de_DE.UTF-8
LC_MEASUREMENT=de_DE.UTF-8
LC_IDENTIFICATION=de_DE.UTF-8
LC_ALL=

...and I definitively use UTF8.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: locales 2.29-0ubuntu2
ProcVersionSignature: Ubuntu 5.0.0-14.15-generic 5.0.6
Uname: Linux 5.0.0-14-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue May 14 11:17:39 2019
PackageArchitecture: all
SourcePackage: glibc
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan wayland-session

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https://bugs.launchpad.net/bugs/1828983

Title:
  isalpha() doesn't include Umlaute even if LC_CTYPE=de_DE.UTF-8

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