To hear voices in your dream signify a message from the subconscious or spiritual realm. Alternatively, the dream may be a metaphor that you need to "voice" your opinions more loudly. Speak your mind!
To hear or speak a foreign language in your dream indicates a message from your subconscious that you do not yet understand. Alternatively, you may not be making yourself clear to others.
To dream that you are studying a foreign language suggests that you are having difficulties expressing your thoughts. You are confronted with some unfamiliar problem that you do not know how to approach and resolve in your waking life.
To dream of a foreign language represents a mindset that you don't understand or agree with. Someone may have an idea or belief system that you don't subscribe to. Feeling excluded or "apart" from something. Alternatively, you may feel that others are not making themselves clear to you.
To dream of studying a foreign language represents your attempt to understand the behavior of a person or situation that is currently unfamiliar to you.
To dream that you or someone is yelling represents repressed anger that needs to be expressed. If you are yelling and no one hears, then it suggests that you are being overlooked in some waking situation. You feel that your voice does not matter or that your opinion does not count. In particular, hearing demonic yelling in your dream means there is something you thought you have left in the past that is still haunting you.