Many sections of Title 8 detail the training instruction employers are to provide, but don't necessarily specify what the employer must do to be sure the employee understands the training. In the absence of such specifics, the regulation that applies to all employers is Section 3202, the Injury and Illness Prevention Program (IIPP).
Subsection (a)(3) of Section 3202 requires a system for "communicating with employees in a form readily understandable by all affected employees on matters relating to occupational safety and health..." That means, as an employer, your program or those necessary parts of the program, are to be readily understood by your employees, be they in the form of pictographs or a second language.
This does not mean the entire IIPP has to be converted to several languages where there is a multilingual workforce. Those parts that affect a group of people engaged in a specific task may have to be written or communicated in a language other than English, or be made into a form readily understandable and made available to those workers.