Most applicants will have a good example of a long term stay abroad, if not you will have to make the most of any experience that you do have. Key points to bring out from your trip abroad are; show how you have used your language skills independently, try and use an example of when you have used your language skills in a working environment, and a social environment, and in a stressful situation. If you studied abroad highlight the importance of using your language skills in an academic environment. Each of these could be important in a career in languages.