title: Error message when starting vim: "Failed to set locale category LC_NUMERIC to en_CH" (or en_BR, en_RU & LC_TIME, LC_COLLATE, LC_MONETARY, LC_MESSAGES)
body: <p>I freshly installed <code>vim</code> (Vi IMproved 8.1) as a text editor on my MacOS 10.14.5 with Homebrew. Each time that I run vim I get this error message:</p>
  
  <pre><code>Warning: Failed to set locale category LC_NUMERIC to en_CH.
  Warning: Failed to set locale category LC_TIME to en_CH.
  Warning: Failed to set locale category LC_COLLATE to en_CH.
  Warning: Failed to set locale category LC_MONETARY to en_CH.
  Warning: Failed to set locale category LC_MESSAGES to en_CH.
  </code></pre>
  
  <p>I have to click ENTER and it works but I would like to get rid of that error message.</p>
  
  <p>I saw a similar message on <a href="https://discourse.brew.sh/t/failed-to-set-locale-category-lc-numeric-to-en-ru/5092/7" rel="noreferrer">that link</a></p>
  
  <p>How can I get rid of this error message?</p>