Thanks for asking.

You would need to choose which frontend/community you want to use to publish a specific post. Using multiple communities to publish the same post will just post the same content multiple of times on the blockchain which could be considered spam and attempt farm the rewards for the same posts by using many tags and communities.
If you would like to repost the same article in other community, please decline the payout on the repost.

You can use the cross-post feature. I think that peaked has this option. The cross-posted article has automatically decline payout.

Regarding the translations of the posts in one of 7117 languages.
Please, either include translations into other languages in the same post or decline the payout in the translation posts.
As it would also be considered recycled post spam.