General improved translatability would improve dx on custom datatypes

[nonprofittechy]

1. JavaScript is initialized at python module loading, which freezes the language of the strings
2. Only workaround we have right now is to pass custom validation messages as parameters

[BryceStevenWilley]

SuffolkLITLab/docassemble-ALToolbox#317 has more discussion on translation with custom datatypes.

[nonprofittechy]

One (possibly dead-end) idea: https://docassemble.org/docs/functions.html#linguistic