diff --git a/lang/en.yml b/lang/en.yml
index a49b45c..4532366 100644
--- a/lang/en.yml
+++ b/lang/en.yml
@@ -19,8 +19,16 @@ en:
     CODE_415: '415 - Unsupported Media Type'
     CODE_416: '416 - Request Range Not Satisfiable'
     CODE_417: '417 - Expectation Failed'
+    CODE_418: "418 - I'm a teapot"
+    CODE_421: '421 - Misdirected Request'
     CODE_422: '422 - Unprocessable Entity'
+    CODE_423: '423 - Locked'
+    CODE_424: '424 - Failed Dependency'
+    CODE_425: '425 - Too Early'
+    CODE_426: '426 - Upgrade Required'
+    CODE_428: '428 - Precondition Required'
     CODE_429: '429 - Too Many Requests'
+    CODE_431: '431 - Request Header Fields Too Large'
     CODE_451: '451 - Unavailable For Legal Reasons'
     CODE_500: '500 - Internal Server Error'
     CODE_501: '501 - Not Implemented'
@@ -28,14 +36,19 @@ en:
     CODE_503: '503 - Service Unavailable'
     CODE_504: '504 - Gateway Timeout'
     CODE_505: '505 - HTTP Version Not Supported'
+    CODE_506: '506 - Variant Also Negotiates'
+    CODE_507: '507 - Insufficient Storage'
+    CODE_508: '508 - Loop Detected'
+    CODE_510: '510 - Not Extended'
+    CODE_511: '511 - Network Authentication Required'
     DEFAULTERRORPAGECONTENT: "<p>Sorry, it seems you were trying to access a page that doesn't exist.</p><p>Please check the spelling of the URL you were trying to access and try again.</p>"
     DEFAULTERRORPAGETITLE: 'Page not found'
     DEFAULTSERVERERRORPAGECONTENT: '<p>Sorry, there was a problem with handling your request.</p>'
     DEFAULTSERVERERRORPAGETITLE: 'Server error'
     DESCRIPTION: 'Custom content for different error cases (e.g. "Page not found")'
-    PLURALNAME: 'Base Pages'
+    PLURALNAME: 'Error Pages'
     PLURALS:
       one: 'An Error Page'
-      other: '{count} Base Pages'
+      other: '{count} Error Pages'
     SINGULARNAME: 'Error Page'
     db_ErrorCode: 'Error code'
diff --git a/src/ErrorPage.php b/src/ErrorPage.php
index 1bc27a6..82314e1 100644
--- a/src/ErrorPage.php
+++ b/src/ErrorPage.php
@@ -403,8 +403,16 @@ protected function getCodes()
             415 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_415', '415 - Unsupported Media Type'),
             416 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_416', '416 - Request Range Not Satisfiable'),
             417 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_417', '417 - Expectation Failed'),
+            418 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_418', "418 - I'm a teapot"),
+            421 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_421', '421 - Misdirected Request'),
             422 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_422', '422 - Unprocessable Entity'),
+            423 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_423', '423 - Locked'),
+            424 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_424', '424 - Failed Dependency'),
+            425 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_425', '425 - Too Early'),
+            426 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_426', '426 - Upgrade Required'),
+            428 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_428', '428 - Precondition Required'),
             429 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_429', '429 - Too Many Requests'),
+            431 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_431', '431 - Request Header Fields Too Large'),
             451 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_451', '451 - Unavailable For Legal Reasons'),
             500 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_500', '500 - Internal Server Error'),
             501 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_501', '501 - Not Implemented'),
@@ -412,6 +420,11 @@ protected function getCodes()
             503 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_503', '503 - Service Unavailable'),
             504 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_504', '504 - Gateway Timeout'),
             505 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_505', '505 - HTTP Version Not Supported'),
+            506 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_506', '506 - Variant Also Negotiates'),
+            507 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_507', '507 - Insufficient Storage'),
+            508 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_508', '508 - Loop Detected'),
+            510 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_510', '510 - Not Extended'),
+            511 => _t('SilverStripe\\ErrorPage\\ErrorPage.CODE_511', '511 - Network Authentication Required'),
         ];
     }