Rename rebuttals to government_responses in locale files
Decouple search_format_type from singular_name in NesArticleType

This should mean if we need to rename any of these in the future we don't have to reindex the content as the search_format_type is not dependant on what we want the thing to be displayed on the front-end as.
Remove all published news articles from search, then add again

This so we can put the new search_format_types for government response (née rebuttal) type news.