fix(languages): Load default en language support if none explitly req…

…uested

classes/base.lua

@@ -57,6 +57,12 @@ function class:_init (options)
   self:setOptions(options)
   self:declareFrames(self.defaultFrameset)
   self:registerPostinit(function (self_)
+      -- In the event no packages have called \language explicitly or otherwise triggerend the language loader, at this
+      -- point we'll have a language *setting* but not actually have loaded the language. We put it off as long as we
+      -- could in case the user changed the default document language and we didn't need to load the system default one,
+      -- but that time has come at gone at this point. Make sure we've loaded somethnig...
+      local lang = SILE.settings:get("document.language")
+      SILE.languageSupport.loadLanguage(lang)
       if type(self.firstContentFrame) == "string" then
         self_.pageTemplate.firstContentFrame = self_.pageTemplate.frames[self_.firstContentFrame]
       end