It does not happen that often that the lists of devices, entities, helpers etc. are filtered down to a single item.
But in that case the labels currently use incorrect plural which is more irritating in some languages but also wrong in English.
This commit fixes this by adding ICU syntax to all six strings so these work properly in English and all derived translations.
For languages that need a different wording for `zero` this also helps translators in extending the ICU syntax for that case.