code: public CMAArray<CMALocale> fetchAll(String spaceId, String environmentId) {
      assertNotNull(spaceId, "spaceId");
      assertNotNull(environmentId, "environmentId");
  
      return service.fetchAll(spaceId, environmentId).blockingFirst();
    }
docs: Fetch all locales of the given space and environment.
  <p>
  This method will override the configuration specified through
  {@link CMAClient.Builder#setSpaceId(String)} and
  {@link CMAClient.Builder#setEnvironmentId(String)}.
  
  @param spaceId       the space identifier, identifying the space.
  @param environmentId the environment identifier, identifying the environment.
  @return the array of locales.
  @throws IllegalArgumentException if spaceId is null.
  @throws IllegalArgumentException if environmentId is null.