The UM.Application.platform property has been removed by someone for quite some time.
I don't know why the check was in there, but it doesn't seem needed at all as the property was always undefined
These strings were recently found to have been confusing to the translators. Improvements are:
- Pulling the (untranslated) error message out of the message sentence. We really want the error message to be at the end so we'll force the translators to translate it as a prefix.
- Remove extra spaces at the end.
- Remove Python logic from within the i18nc call, since gettext doesn't understand that.
Contributes to issue CURA-5741.
