Temporary set 'Default language for the frontend' to whatever (not English) language you know, add English (and import regular conntent), reset 'Default language for the frontend' and add all other languages.But what if the default language should be English?
Since only admin knows what language regular content is in, CMSms-mle-fork capable of importing content to the first mle language, no matter what it is.
If there were used all columns of regular CMSms you could not change default mle language at any time, or content would be mixedup, or it would be complex operation to copy mle content from suffixed (appended with BD block lke '_en') to regular columns and vice versa.