relax language format warning

[fatmalama]

EvergreenAdmx complains when including languages es and es-419:
WARNING: Language not in expected format: es es-419

es-419 definitely is a valid one (latin american spanish) and I've seen google previously ship es (maybe erroneously)

[msfreaks]

Looks like the warning is about "es es-419", not "es" and "es-419"?

Please try without "es", which is definitely not supported.