Punjabi was a language spoken in the Punjab region of India and Pakistan. (TV: Demons of the Punjab)
Bernice Summerfield could understand the language after having travelled with the Seventh Doctor. (PROSE: All-Consuming Fire)
The TARDIS translated into Punjabi when the Thirteenth Doctor, Ryan Sinclair, Yasmin Khan and Graham O'Brien arrived in Punjab in 1947. Prem believed they spoke very good Punjabi for foreigners. (TV: Demons of the Punjab)
Yasmin Khan's grandfather often swore loudly in Punjabi when he accidentally injured himself. He hoped that she hadn't understood, but Yasmin spoke Punjabi. She pondered on these memories 12 years later in 2012. (AUDIO: Fallout)