When getting SubtitleLanguage description, also check if there's a standard_language to retrieve description from.
When getting SubtitleLanguage description, also check if there's a standard_language to retrieve description from.

For: https://unisubs.sifterapp.com/projects/12298/issues/642887/comments

pculture/unisubs,ofer43211/unisubs,ujdhesa/unisubs,ujdhesa/unisubs,pculture/unisubs,norayr/unisubs,wevoice/wesub,norayr/unisubs,eloquence/unisubs,ReachingOut/unisubs,wevoice/wesub,ujdhesa/unisubs,pculture/unisubs,eloquence/unisubs,norayr/unisubs,wevoice/wesub,ofer43211/unisubs,eloquence/unisubs,pculture/unisubs,eloquence/unisubs,norayr/unisubs,ReachingOut/unisubs,ofer43211/unisubs,ofer43211/unisubs,ujdhesa/unisubs,ReachingOut/unisubs,ReachingOut/unisubs,wevoice/wesub