[evolution-data-server] Added new translatable string

[Milan Crha <mcrha redhat com>]

        Hello,
I just committed a change [1], which adds a new translatable string
"until start time", meaning "Snooze, until event start time". I thought
it's a relatively simple change, thus no need to postpone to the
following stable series.
        Bye,
        Milan

[1] https://gitlab.gnome.org/GNOME/evolution-data-server/-/commit/9b36f52297cdbb6a674618f52477f74158da05c6