Not being understood in a foreign language is traditionally read as feeling unheard by someone close. Dream books see it as a wall between what you feel and what others can receive.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.