]
                        ],
                        'translate' => [],
-                       'locales' => '%kernel.translator.fallbacks%',
                        'languages' => [
                                'en_gb' => 'English'
                        ],
                                                ->defaultValue($defaults['translate'])
                                                ->scalarPrototype()->end()
                                        ->end()
-                                       ->scalarNode('locales')->cannotBeEmpty()->defaultValue($defaults['locales'])->end()
+                                       #TODO: see if we can't prevent key normalisation with ->normalizeKeys(false)
                                        ->arrayNode('languages')
                                                ->treatNullLike([])
                                                ->defaultValue($defaults['languages'])