I don't know if there'll always be an English speaking operator nearby when calling an emergency number. I assume it depends on the specific service and where they are decentrally organised, the region. There are some experiences for 144 in this thread. Poison control has an English brochure so I assume they offer English speaking assistance most of the time.

There are some considerations to combine the police, ambulance and fire emergency numbers sometime in the 2010s, probably under the GSM emergency number 112. Such an infrastructure would possibly cover foreign languages better.

All in all, English assistance is not a given. Also in other first world countries, it has recently been pointed out to me that the police's operators in Lithuania don't speak English either.