Status 406 Saving a Translation

Basically, I’m having trouble saving the translation of a plugin. I was able to translate the plugin a couple of days ago without any problem and save it. Yesterday I opened it again to correct translations and it didn’t let me save anything.

I don’t know if it is directly a problem with the Loco Translate plugin or with the plugin itself. It shows error 406 and the console displays this message:

Status 406 “Not Acceptable” (text/html 156 bytes)
406 Not Acceptable
406 Not Acceptable
nginx
====

I don’t know if I should fix something in my ftp, loco or the pugin I use to translate.

I also tried to retrace my steps but it didn’t work. Thanks in advance!

The page I need help with: [log in to see the link]