I am not sure if LingoHub has support for that, but I have used Transifex and it provides an easy way to support the rules for each translated language. See the picture below for translation from English to Arabic, and they way it handles the different Arabic rules:
The current implementation has support for plural form that is compatible with the English language, so there are only two rules "single" and "many", while many other languages have more. See https://developer.mozilla.org/en-US/docs/Mozilla/Localization/Localization_and_Plurals
I am not sure if LingoHub has support for that, but I have used Transifex and it provides an easy way to support the rules for each translated language. See the picture below for translation from English to Arabic, and they way it handles the different Arabic rules:
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