the personnel files and even the Lcars maps as well as the TOS medical bay among others are all readable. But when you look closely at the Ship computers most of the time (not counting the other times when sensor readings are written in numbers are letter based.) It is just a bunch of numbers in various boxes on the computer screen. While many will say that they are just random numbers put by the production staff, what is the in universe meaning of the numbers? It is important to point out that any cadet can read sensor readings and pre warp cultures with stolen UFP tech eventually crack the codes. The numbers also seem to be similar across cultures with Starfleet often able to decipher data from old and ancient computers. It wouldn't be to far off to conjuncture that every civilian in the UFP and beyond (among warp capable species) can read all the sensor data with ease. Thus in universe logic dictates that it shouldn’t be that hard for us to decipher the sensor data ourselves.
