Some templates in the source wikis allow different spellings for the same parameter. For example, the Russian information template can say |Описание= or |описание= (note the different capitalization, which is significant). Both should become |Description=. The CommonsHelper2 format we use currently does not allow this, but can, in theory. See https://www.mediawiki.org/wiki/Special:Diff/3056489 for an example that would work if the code would support it.
Some of the code is already prepared for this, but this is neither fully implemented nor carefully tested.
Note this is very close to T198582 (this ticket here will make the other one easier), but not the same.