Translate the following English sentence to French:
"The Community legislation and the jurisprudence of the European Court of Justice still do not offer a sufficient framework although they are undoubtedly key elements to making further progress in this aspect which is essential to safeguarding the rights of pregnant workers."
La législation communautaire et la jurisprudence de la Cour de justice des Communautés européennes n' offrent pas encore un cadre suffisant mais il s' agit indubitablement d' éléments clés pour progresser dans ce domaine essentiel qu' est la garantie des droits des travailleuses enceintes.