installing / refreshing snap impossible to translate

Hi,

In Disco, for ubuntu-release-upgrader package, there is currently an odd string:
%sing snap %s

Manfred Hampl found out:
"that "%s" is a placeholder that is filled with a string parameter, and "ing" is constant text.

Digging into the source https://git.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/tree/DistUpgrade/DistUpgradeQuirks.py#n459 (not sure whether it is the right version), it seems to be another example of bad tricks that make translations impossible.

As far as I can see there are two branches, and depending on the status of the snap, it is either installing or refreshing that snap.
The value of "command" is either "install" or "refresh", and the string %sing results either in "installing" or in "refreshing".

With the way that this was done, I do not see any possibility that the words "install" and "refresh" could be translated to a different language.

The only reasonable solution that I can suggest is a split into two messages, e.g.
…
            if re.search("^installed: ", …
                …
                command = 'refresh'
                self._view.updateStatus(_("refreshing snap %s" % snap))
            else:
                command = 'install'
                self._view.updateStatus(_("installing snap %s" % snap))
            try:
                self._view.processEvents()
…
This would make the strings easily translatable."