I have a small framework I built for developing small web apps faster and it also has a translation engine very much like this, basically what it does is:

    <span class="text-muted">$T(Detajet e blerësit)</span>

and it translates it to:

    buf.WriteString(T(`Detajet e blerësit`))

T is a function that takes a string and returns a string from static map that gets built when app starts or when somebody translates a label.