Welcome to the forum! With the time, you will notice that not everyone here uses Trisquel, for example I use Parabola (pitifully, I cannot recommend it to you, because you need experience to use it) but some others use Debian, Devuan, etc.

About your issue, try running
setxkbmap CODENAME
replace CODENAME with the Esperanto keyboard codename, which I don not know. If there is an Esperanto website, maybe the suffix could be, for example a Spanish (Spain) website ends with .es like example.es

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