CO-3893 Add support language detection support for Letter (#1476)
CO-3893 Add support language detection support for Letter (#1476)

* CO-3893 Add support language detection support for Letter

minor fix: ensure that the number of file computation is only for done in certain status

* fix according to PR
CompassionCH/compassion-switzerland,CompassionCH/compassion-switzerland,CompassionCH/compassion-switzerland