Cybertronian language
It should be little surprise, given a moment's thought, that distinct Cybertronian languages exist. The Transformers did not go about speaking English or any other known Earth language long ages ago on their distant metal world. Though the records of such conversations are frequently translated for us, we should not forget that these conversations originally flowed in odd electronic sylables past strange metalic lips, or were etched by alien hands long eons before the first humans painted muddy shapes upon dark cave stone.
Generation 1
Marvel Comics
Runamuck and Runabout sprayed Cybertronian grafitti across Earth monuments.
Animated series
The first language used by the Transformers was likely the Quintesson language inherited from their former masters. It can be seen upon the walls of the Quintesson dimensional transporter room. Madman's Paradise
Ancient Autobot was the language used by the ancient Autobot colonists that fled Cybertron in the distant past. Most modern transformers could not read it. Cosmic Rust
Beast Wars
Cybertronix is the name of the modern written language of the Maximals during the Beast Era. Whether this is the same language spoken on Cybertron durring earlier portions of the Generation 1 continuity or at all similar to that written and spoken aloud in the live action Transformers Movie is unknown. As it is specifically refered to as the "modern written language," it seems likely that there were other Cybertronian languages, with other names, at some point in the past. The computers on the Chromia 10 label displayed planets in Cybertronix. Razor's Edge
Transformers (2007) movie
The Decepticons communicate in actual Cybertronian when speaking among themselves.
