The media is very good about reminding people that 911 has interpreters, so
you should call 911 even if you don't speak English. However, it might be
helpful to mention what information a caller needs to provide to get the 911
dispatcher to set up with an appropriate interpreter as soon as possible.
It's nice to know that interpreters are available, but surely 911
dispatchers aren't able to instantly identify every major language,
especially when it's being spoken by someone who's panicking. Non-English
speakers probably realize this, but don't know what information they need to
provide or how to say it in English, so they don't call 911.

The media should find out what information the 911 dispatchers most need
from non-English speakers (The name of their language in English? The
phrase "I need a [language] interpreter"? The words "police", "fire" and
"ambulance"?) and publish this every time they're encouraging people to call
911 right away. That way, non-English speakers could memorize one or two
simple words or phrases, and rest easy with the knowledge that they know
exactly what to say to get help.