typing error in context.json

[bourgeoa]

shouldn't be 'dc' in lieu of 'dct'

[RubenVerborgh]

shouldn't be 'dc' in lieu of 'dct'

dct is the commonly used prefix for http://purl.org/dc/terms/,
but you are right that dc ('http://purl.org/dc/elements/1.1/') is missing.