I'm trying to login to phpMyAdmin with german language, but all I get is
(lines marked with * translated back from german)

    Error *

    SQL command:  Edit *

    SET lc_messages = 'de_DE';
    MySQL reported: *

    #1231 - Variable 'lc_messages' can't be set to the value of 'de_DE'


Workaround: switch phpMyAdmin to english


I can reproduce this error by running   SET lc_messages = 'de_DE';   in the
'mysql' commandline client.

Even if this happens in phpMyAdmin, my guess is that this is a problem in
MariaDB. If you think I'm wrong, feel free to reassign to the phpMyAdmin
maintainer ;-)