Astro NJOI - a TV channel package, had its 20th anniversary and the company wanted to make sure people were aware of this. To increase relevancy among different target audiences, the campaign ads were in multiple different languages. This is a good strategy when speaking to specific audiences.
When using multiple languages in your ads, remember to double check that your ads are targeted to people who speak the respective languages. Otherwise, the relevance of your ads to the users may reduce significantly.