For this specific locales you can replicate the value from other to many. So for example your file will look something like
#: src/main.py:340
msgid "plural"
msgid_plural "plurals"
msgstr[0] "Ваш суд заканчивается через 1 день"
msgstr[1] "Ваш суд заканчивается через % @ дня"
msgstr[2] "Ваш суд заканчивается через % @ дней"
msgstr[3] "Ваш суд заканчивается через % @ дня"
After adding the missing variations flor plurals the error should disappear, consider that each language might have different rules for plurals.
Best regards,
Carlos Olvera from Transifex Support Team
Is this a translation file that you are trying to upload to the same project-resource? If so you need to send the same information across all the files. The error is related to missing plurals, seems that you are sending just a line while Transifex is expecting to see the one, other relationship.
Transifex is expecting that resource string ‘582731090’ fullfills the conditions, not sure what is the string since we cannot see it inside a project, can you can check it and add the missing information? Or share the URL of your project?