Libreoffice needs to run with an UTF-8 locale, otherwise it does not use proper
encoding for text files.
cloudooo sets a default locale as a fallback, but using en_US.UTF-8, which is
not always present (it is not present on capri testnodes). Anyway, this kind
of configuration is the job of slapos, so we prefer to have it done at slapos
level.