The travel translator is finding a new niche in education and public health, getting the word out about vaccinations and medical care in multiple languages. (The new Pocketalk Plus is much larger than the Pocketalk S.)What do you do with a travel gadget when no one's traveling? That problem faced Japan's Pocketalk at the beginning of last year. Pocketalk is a handheld translator, designed to help travelers have conversations abroad. But the company discovered that ...