Modded Minecraft crops cannot be replanted by villagers because the code does not allow their list of items they can plant to be changed.
To my knowledge, not a single mod that adds crops has this feature either.
This simple mod allows for any IPlantable crop to be planted by villagers (This would be any properly coded modded crop).
It does not allow modded crops or foods to be used to breed villagers.
Additionally it does not fix how villagers choose to plant things, so they will still plant whatever they want in whichever field they can reach.
Notice: This is a core mod and uses mixins to inject code into EntityVillager.canVillagerPickupItem and EntityVillager.isFarmItemInInventory.
Currently only for MC 1.12.2, but fixes for 1.14 and 1.15 will eventually follow