fix `undefined array key "lan"` error
was getting the following error from a clean build using php 8.1.2: ```"Warning: Undefined array key "lan" in ~/thebookofshaders/header.php on line 4"``` Was going to use `isset` but it seems like a banged `!empty` is used elsewhere. am not a php dev so will defer to anyone who feels more confident.pull/367/head
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