# lang/load Load a lang file into the catalog, replacing any existing entries for the app. The file is a nested map: `%{ :fallback "en" :es %{ :welcome "Hola, {name}" } }`. The app name defaults to the file's parent directory name. ## Syntax

[lang/load "path" ?app]

## Parameters - `"path"` — lang file path (string) - `?app` — (optional) app name (string or keyword); defaults to the file's directory name. ## Examples

[lang/load "packages/chat/lang.dft"]    # app "chat" from the dir name
[lang/load "tmp/strings.dft" "chat"]    # explicit app

## Returns Boolean — `true` when the file exists and parses to a map, `false` on any read/parse failure. `%Err{:message}` when the path is missing, the app argument is not a string/keyword, or no app name can be derived from the path. The file becomes the app's write-back target for `lang/set`/`lang/unset`. Map entries above the phrase level are treated as languages, `:fallback` sets the fallback language, and only string phrase values are stored. ## See Also `lang/get`, `lang/set`, `lang/langs`