I have telepathy as the MM1 says:
A creature with this ability can communicate telepathically with any other creature within a certain range (specified in the creature’s entry, usually 100 feet) that has a language. It is possible to address multiple creatures at once telepathically, although maintaining a telepathic conversation with more than one creature at a time is just as difficult as simultaneously speaking and listening to multiple people at the same time. Some creatures (such as the Pseudodragon) have a limited form of telepathy, while others (such as the Formian Queen) have a more powerful form of the ability.
Another player said that I cannot speak to someone unless I have the same language as them, according to the "language rules". Is this true?