lb308 I think it can be done with bbcode for example in the tilte and body we can use :
[EN]Hello I am a post.[/EN]
[FR]Salut je suis un article.[FR]
But this would mean that every user should know all the other languages...
In my opinion, there are too possible issues.
ahrasis Personally I would prefer single database rather than sharing users between databases so my preferred approach will be multi flarum forum with single database
An approach like WordPress' one could be taken, adding a prefix to the tables, but I'm not a fan anymore of the tags...
I believe that 2 languages should require 2 different communities, but with a common userbase (so I can be Pandry on both of them).