[evolution] String freeze break approval plea

[Milan Crha <mcrha redhat com>]

        Hello,
a user reported a typo in a translatable string [1]. I can fix it, but
it would break existing translations, even it is visible only in
GSettings, dconf-editor and similar tools. The faulty string had been
added before 3.33.1 release.

Can I correct the string, please?
        Bye,
        Milan

[1] https://gitlab.gnome.org/GNOME/evolution/issues/592