Engineering drawing have their own language and governed by many different rule and conventions in a very cryptic manner. They have intended to convey a lot of information in a very compact way.
One of the best examples is a piping and instrumentation diagram, or P&ID. There are many abbreviations of the instruments and active devices in the system, like PI for pressure indicator and MOV for motor operated valve. This is obvioulsly language dependent since the abbreviations for thsoe devices would be different in another language. And other kinds of drawings, particularly contruction drawings, can have a lot of written instructions/descriptions in them in addition to the drawn figures.
So they are absolutely language dependent. You may be able to find some types that just have numbers, like wiring diagrams, but there is at least a title box telling you what you are wiring to that is in a specific language. No escape.
power plant engineer