[evolution-data-server] String/UI freeze break approval plea for 3.12.x branch

[Milan Crha <mcrha redhat com>]

        Hello,
I re-enabled concurrent connections for IMAP accounts in
evolution-data-server 3.12.1, which is supposed to increase
responsiveness of these accounts, but it turned out that some servers
doesn't like this. It can be disabled by editing files with path like
  ~/.config/evolution/sources/<some-weird-file-name>.source
but it is quite inconvenient.

The master branch includes a simple fix [1], which re-adds strings into
evolution-data-server. It also influences UI in evolution, the new
values are shown in Account properties, in the Receiving Options tab.

I believe it'll be better to see the options there untranslated, than
chasing internal files of evolution.

Would you object if I commit the change [1] into stable branch of
evolution-data-server, please?
        Thanks and bye,
        Milan

[1] https://git.gnome.org/browse/evolution-data-server/commit/?id=8c3d0d4b29