code: def load_config(from_key, to_key):
          
          from .mappings import mappings
          kbs = {}
          for key, values in mappings['config'].iteritems():
              parse_dict = {}
              for mapping in values:
                  # {'inspire': 'Norwegian', 'cds': 'nno'}
                  # -> {"Norwegian": "nno"}
                  parse_dict[mapping[from_key]] = mapping[to_key]
              kbs[key] = parse_dict
          return kbs
docs: Load configuration from config.
  
          Meant to run only once per system process as
          class variable in subclasses.