Localization

strings/<locale>.toml, one file per language, and strings::tr to read one with the right plural form.

What landed

• Files. A key maps to a string, or to the plural forms of one. {name} in a string is replaced by the argument called name, and an n argument also picks the plural form the locale's language calls for.
• Fallback. A key missing from the current locale is looked for in the project's fallback locale, one step, not a chain. Missing from both, the key itself comes back — visible in the game rather than blank, because a missing string is a bug to notice and an empty label is a bug to miss.
• Switching. strings::set_locale, strings::locales for what the project ships, and strings::system_locale for what the OS says.

# strings/en.toml
"menu.play" = "Play"
"menu.items" = { one = "{n} item", other = "{n} items" }

let label = strings::tr("menu.items", #{ n: 3 });   // "3 items"

The strings module is in the script modules reference.