If I were the employer, I'd mandate English as a prerequisite for hiring. Period. And in MY place of business, the only time another language would be acceptable would be IF A CUSTOMER initiated the conversation.
Foreign language skills are handy sometimes. Only a fool lacks the ability or refuses to distinguish those times.
That's not a bad policy...it should be all about what the customer wants...I own some apartment buildings and had my lease translated into Spanish...I increased occupancy by 4%...I am now over 96% on all three properties...CHA CHING!
That was well worth the $1000 I paid the translator.