
From my experience with LINE, there could be terrible misunderstandings that could translate into the opposite of what is being conveyed, especially since people in chats don't care about grammar and punctuation. Add to that the slang terms from each language, such as ASAP, YW, brb, etc....
Not the desired solution, but ...
If Win / Browser:
Note:
Reverse:
Even the Plarium chat app has no translator. And low uptake. Despite the ability to group people - e.g. Main Chat where enemy can't see, or Order Battle Group or something. But at least you can cut and paste - no images though.
Without translation and images, I don't expect the Plarium app will reach any critical mass. Pictures are worth 1k words, especially in this game where different languages see different things. e.g. Eternal Stronghold vs Bastion Éternel, or Plans versus Draftings.
'course Discord has all of the above built in.
(Including the ability to screenshot as above, Ctrl-V in chat to yourself in Discord [uploading the image], then right-click the Discord image and copy the link for insertion into this forum.)