"if this should be a quoted substitution.
var="foo" echo $"var"
var="foo" echo "$var"
$".." is a localized string, for example,
echo $"Hello $USER" along with the proper translation files can be used to have the script say "Bonjour, youruser" in French locales.
In this case, ShellCheck found a localized string whose contents is also the name of a variable. This could have happened because the user wanted a far more common quoted substitution, e.g.
"$var", but accidentally switched the leading
If you do want a localized string whose contents is also an active variable, you can ignore this warning or rename the variable.
ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.