title: Awk tolower a string that starts with an accent - support for foreign characters
body: <p>I have a file with this string in a line: <strong>"Ávila"</strong></p>
  
  <p>And I want to get this output: <strong>"ávila"</strong>.</p>
  
  <p>The problem is that the function <strong>tolower</strong> of awk only works when the string does not start with accent, and I must use awk.</p>
  
  <p>For example, if I do <strong>awk 'BEGIN { print tolower("Ávila") }'</strong> then I get <strong>"Ávila"</strong> instead of <strong>"ávila"</strong>, that is what I expect.</p>
  
  <p>But if I do <strong>awk 'BEGIN { print tolower("Castellón") }'</strong> then I get <strong>"castellón"</strong></p>