It would be useful to collect data from non-native speakers of a language. More and more such individuals are appearing in all countries, and devices that accept spoken words should not break because of someone's level of command of a spoken language. For example, a Swiss speaking German (Hochdeutsch), or more clearly, a Brit speaking French, etc. Some children who grow up in multi-lingual families also intermix words from multiple languages into their sentences. We can still understand them.