Hi,
sadly Google are changing things so don't think these translators are going to work for much longer. See this article which explains what is happening:
https://www.argotrans.com/blog/goodbye- ... -websites/
This arrowcaht app used to work beautifully in our chat but now it won't translate incomming messages - only your own (if you change your own language to your own first that is).
Also, as arrowchat is changing (and looking to get rid of the apps feature I believe) you will need to find an alternative solution. I am looking at GTranslate, their free version works same as this one but now has the same issue. They have paid versions but not tried yet to see if they can change the chat as some don't.
On sites that use chat globally having a translator is crucial, so hope we can find a way to address it.