This addendum for FileMaker Go app is a pretty handy reference of functions, script steps, error codes, etc. The link below takes you to a page in French. Here’s the translation of the download screen for those of us not able to read French:
The addendum supports multiple languages:
Addendum is an application that lists the functions, script steps, script triggers, error code and glossary of FileMaker.This application is a tool for the development of databases FileMaker Pro 13, available at any time on your iOS device.
Pré-requis: FileMaker Go 13
Update (Thanks, Sebastion!): There is now a dedicated website in english for this app : http://addendum.fmdata.fr/en