There are indications that Watchtower does receive awards from governments as they are helping to print material in less known native languages. The Navajo nation is very happy that Watchtower is trying to present information in that language, including written material because it was considered being on the cusp of extinction at least when it came to the written form.
I don't know about incentives when it comes to languages, but I do know that they do accept government grants when it is offered to them in accordance to their normal activities. I know for sure that at Patterson, that New York City subsidies their water treatment center. The New York EPA gave the City the option of cleaning up their own water or paying people above them to clean up their waste water. Since Paterson is in the Hudson Valley, NYC does pay them for their waste water treatment. I know that bethelites do have to put down their costs center when they get materials for a job for audit and accounting purposes, most of the time it is pretty lax because it doesn't affect too much, except when it comes to working in the treatment plant. Every time there has to accounted for because they send the costs to NYC and they pay a certain percentage.