An excellent idea. I also think that knowing how to say , "where is the toilet?" is another important question in any language.

German: 1. "Ich bin allergisch gegen Erdnüsse." 2. "Ist in diesem Gericht/diesem Essen irgendeine Art von Nüssen enthalten?" 3. It's not usual for a facility/restaurant here to be "nut-free". Maybe one could ask: "Ist diese Einrichtung/dieses Restaurant/dieses Hotel usw. für Leute geeignet, die allergisch gegen Nüsse sind?" = Is this facility/restaurant/hotel suitable for people who are allergic to nuts? 4. "Ich habe Unterzucker." That will be easier to understand if you state first that you have diabetis (assuming you do have it): "Ich bin Diabetiker, und habe Unterzucker". If you buy packaged foot, watch out for a notice in small print, usually at the end of the ingredient list, that says something like "Dieses Produkt kann Spuren von Nüssen/Erdnüssen enthalten." = this product may contain traces of nuts/peanuts. In that case, be careful.

1. У меня аллергия на арахис [u menjá allergíja na aráhis] 2. Есть ли в этом блюде какие-либо орехи? [jest' li v étom bljúde kakíje-líbo oréhi?] 3. Подают ли в этом заведении/ресторане блюда без орехов? [podajút li v étom zavedénii/restoráne bljúda bez oréhov?] 4. У меня гипогликемия (низкий уровень сахара в крови) [u menjá gipoglikemíja (nízkij úroven' sáhara v kroví)] N. Где здесь туалет? [gde zdes' tualét?]

lol are you going to learn all that

Thank you all very much!