update OAI and DOE schemas to use new language_code implementation
update OAI and DOE schemas to use new language_code implementation

fabianvf/scrapi,mehanig/scrapi,jeffreyliu3230/scrapi,fabianvf/scrapi,erinspace/scrapi,erinspace/scrapi,felliott/scrapi,ostwald/scrapi,alexgarciac/scrapi,mehanig/scrapi,CenterForOpenScience/scrapi,CenterForOpenScience/scrapi,felliott/scrapi