Issue for non-ASCII-symbols and slf variable

About: Greasy Fork (Firefox)
HI!
1. Thank you for script, but it need allowing for non-ASCII:
if (english) {
//if (row.id.match(/[^\u0020-\u007F]/) || script.description.match(/[^\u0020-\u007F]/)) row.style.display = 'none';
}
Maybe, it need some settings for various ABC groups? :)

2. Next bug: slf variable is not exist, so run exceptions in lines
slf.appendChild(lab);
and
slf.appendChild(optfil);

Add "slf &&" prefixes to its please.
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