Handle transient errors in config loading etc.

As in: Get the Kubernetes site to build with the new Hugo version.

Updates #10947

hugolib/site.go

@@ -273,6 +273,10 @@ func (s *Site) Language() *langs.Language {
 	return s.language
 }
 
+func (s *Site) Languages() langs.Languages {
+	return s.h.Configs.Languages
+}
+
 func (s *Site) isEnabled(kind string) bool {
 	if kind == kindUnknown {
 		panic("Unknown kind")