I was recently working on project where the panel was labeled only in Chinese.
Several years ago I started using Excel to create all of our directories. I made templates for the different loadcenters and panelboards that we use. I print a copy for the panel but also save a copy to my "panel" folder. This comes in handy when the customer calls and says the receptacles in my family room are not working. I can quickly look up which panel and breaker were dealing with.