a11y: Add HTML lang attribute and utf8 encoding meta tag
See: https://dequeuniversity.com/rules/axe/2.1/html-has-lang
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<!DOCTYPE html>
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<html>
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<html lang="en">
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<head>
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  <meta charset="utf-8">
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  <title>The page you were looking for doesn't exist (404)</title>
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  <meta name="viewport" content="width=device-width,initial-scale=1">
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  <style>
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@@ -1,6 +1,7 @@
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<!DOCTYPE html>
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<html>
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<html lang="en">
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<head>
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  <meta charset="utf-8">
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  <title>The change you wanted was rejected (422)</title>
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  <meta name="viewport" content="width=device-width,initial-scale=1">
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  <style>
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@@ -1,6 +1,7 @@
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<!DOCTYPE html>
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<html>
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<html lang="en">
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<head>
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  <meta charset="utf-8">
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  <title>We're sorry, but something went wrong (500)</title>
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  <meta name="viewport" content="width=device-width,initial-scale=1">
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  <style>
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