When you already had the language package, then put the language folder into [yourmoofolder/app/locale]
Example, we added Spanish language:
#Copy the language folder to [yourmoofolder/app/locale/]
Now go to Admin Dashboard/Site Manager/Languages Manager/Not Installed Languages, press install button:
#Pressing 'Install' to start installing new language.
Wait for the package installed successfully.
#The Languages list
Done, now you can see at front-end:
#The Spanish has been added.
Same as “1. How to install new language for your mooSocial”, change path to upload new language:
Upload the new language folder to [yourmoofolder/app/Plugin/“Plugin name”/Locale]