As suggested by the VDG, add the possibility to have screenshots for plasmoids.
the widget explorer will be modified as well to show the screenshots
in the applet list when available
REVIEW:125134
It is not meant to be shown in widget explorer. It is not being shown
when english language is used because
i18n("Containments") == "Containments"
but in other languages for example x-test
i18n("Containments") == "xxContainmentsxx" and hence this condition
doesn't pass and it shows up in UI