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When you already had the plugin package, then put the language folder into [yourmoofolder/app/plugin]
Example, we added Hehe as new plugin:
#Copy plugin package into [yourmoofolder/app/plugin]
Then go to Admin Dashboard/Plugins Manager/Manager/Not Installed Plugins, pressing on Install button to bein installation.
#Press Install button to begin installation.
When the progress is done, you can see your new installed plugin at Plugins List.