The growing popularity of Swahili

Swahili - or Kiswahili, as its known locally - started as a trade language in East Africa hundreds of years ago, but it has since emerged as one of the most-spoken languages on Earth. With World Kiswahili Day coming up on July 7. The World's Halima Gikandi reports from Mombasa on how attitudes toward the language have changed in Kenya and beyond.