A big worry that stops some people with Addison's from going on holiday is fear of an adrenal crisis. Well, not so much the crisis itself [same old, same old] but how you (or, more honestly, your family) is going to get useful help when they don't speak the local language.
Fortunately, the Society of Endocrinology has done a wonderful job of producing emergency cards [or pics for your mobile] in a range of foreign languages:
Dutch [for the only Hollander who doesn't speak English!]; Finnish; French; German; Greek; Italian; Norwegian; Polish; Romanian; Russian; Spanish; Swedish;Turkish; Urdu.
For details see www.endocrinology.org/adrenal-crisis
I hope others find this as useful as I did!