If you plan to apply for an international internship in the future, now is the time to start preparing yourself linguistically and culturally.

The absolute best way to prepare for an internship culturally and linguistically is to study abroad in the country and deepen your understanding of the culture and language.
If you have already done that, then keep your insight into current events and your professional vocabulary up to date by reading newspapers from your host country on the internet or in your university library.
Meet students from your host country who are studying here. They can give you insight into cultural differences they have experienced first hand and will probably enjoy meeting you and .
If the internship site you are applying for has a website, read the information on it to be familiar with the current issues and common vocabulary words.
Talk to recently returned interns about their recommendations.
Talk to faculty members who visit the country frequently or have lived there.
Visit the office of international programs and request a reading list for the country where you plan to do an internship.
Make sure your language level is at least that required by the internship site. Remember that all minimum requirements are exactly that - minimums. The more work you do to prepare yourself before you leave, the easier it will be for you to adjust and perform.
Keep a running notebook of vocabulary words you may need.
Find a language partner to practice with.