fix(languages): Move language setting declaration to after language supporte exists

Author: alerque

core/languages.lua

@@ -1,8 +1,9 @@
 --- SILE language class.
 -- @interfaces languages
 
-local loadkit = require("loadkit")
 local cldr = require("cldr")
+local loadkit = require("loadkit")
+local setenv = require("rusile").setenv
 
 loadkit.register("ftl", function (file)
    local contents = assert(file:read("*a"))
@@ -54,6 +55,19 @@ SILE.languageSupport = {
    end,
 }
 
+SILE.settings:declare({
+   parameter = "document.language",
+   type = "string",
+   default = "en",
+   hook = function (language)
+      SILE.languageSupport.loadLanguage(language)
+      fluent:set_locale(language)
+      os.setlocale(language)
+      setenv("LANG", language)
+   end,
+   help = "Locale for localized language support",
+})
+
 SILE.registerCommand("language", function (options, content)
    local main = SU.required(options, "main", "language setting")
    SILE.languageSupport.loadLanguage(main)

core/settings.lua

@@ -1,5 +1,3 @@
-local setenv = require("rusile").setenv
-
 --- core settings instance
 --- @module SILE.settings
 
@@ -17,26 +15,6 @@ function settings:_init ()
    self.defaults = {}
    self.hooks = {}
 
-   self:declare({
-      parameter = "document.language",
-      type = "string",
-      default = "en",
-      hook = function (language)
-         if SILE.scratch.loaded_languages and not SILE.scratch.loaded_languages[language] then
-            SU.warn(([[
-               Setting document.language to '%s', but support for '%s' has not been loaded
-
-               Consider invoking \language[main=%s] which loads language support before
-               setting it or manually calling SILE.languageSupport.loadLanguage("%s").
-            ]]):format(language, language, language, language))
-         end
-         fluent:set_locale(language)
-         os.setlocale(language)
-         setenv("LANG", language)
-      end,
-      help = "Locale for localized language support",
-   })
-
    self:declare({
       parameter = "document.parindent",
       type = "glue",