It is obvious that people prefer to choose travel destinations where they are able to, at least, navigate. For that reason, many countries have multilingual navigation signs so the tourists feel comfortable travelling across the region.
The same logic applies to an earlier phase of the travellers intent when they are making decisions on where they will spend their next vacation. If your potential visitors are able to access information in their native or at least conversational language, they are most likely to increase their confidence in your services and will be more likely to perform a purchase decision.