diff --git a/typo3/sysext/core/Classes/Localization/LocalizationFactory.php b/typo3/sysext/core/Classes/Localization/LocalizationFactory.php
index 03b908f6183ff90e0a894f06244d4c533f2ba630..07ca8afc34c766865b75e0cf21d6bdc15dca5bc5 100644
--- a/typo3/sysext/core/Classes/Localization/LocalizationFactory.php
+++ b/typo3/sysext/core/Classes/Localization/LocalizationFactory.php
@@ -42,16 +42,6 @@ class LocalizationFactory implements \TYPO3\CMS\Core\SingletonInterface
      * Class constructor
      */
     public function __construct()
-    {
-        $this->initialize();
-    }
-
-    /**
-     * Initialize
-     *
-     * @return void
-     */
-    protected function initialize()
     {
         $this->store = GeneralUtility::makeInstance(LanguageStore::class);
         $this->initializeCache();
@@ -142,7 +132,7 @@ class LocalizationFactory implements \TYPO3\CMS\Core\SingletonInterface
             /** @var $parser \TYPO3\CMS\Core\Localization\Parser\LocalizationParserInterface */
             $parser = $this->store->getParserInstance($fileReference);
             // Get parsed data
-            $LOCAL_LANG = $parser->getParsedData($this->store->getAbsoluteFileReference($fileReference), $languageKey, $charset);
+            $LOCAL_LANG = $parser->getParsedData($this->store->getAbsoluteFileReference($fileReference), $languageKey);
         } catch (Exception\FileNotFoundException $exception) {
             // Source localization file not found, set empty data as there could be an override
             $this->store->setData($fileReference, $languageKey, []);
diff --git a/typo3/sysext/core/Classes/Localization/Parser/AbstractXmlParser.php b/typo3/sysext/core/Classes/Localization/Parser/AbstractXmlParser.php
index dffc270e0e639887a82996423784f2ff84b41aa7..4dba8e2c358ad95f9606bf5b33addf1029555660 100644
--- a/typo3/sysext/core/Classes/Localization/Parser/AbstractXmlParser.php
+++ b/typo3/sysext/core/Classes/Localization/Parser/AbstractXmlParser.php
@@ -14,7 +14,6 @@ namespace TYPO3\CMS\Core\Localization\Parser;
  * The TYPO3 project - inspiring people to share!
  */
 
-use TYPO3\CMS\Core\Charset\CharsetConverter;
 use TYPO3\CMS\Core\Localization\Exception\FileNotFoundException;
 use TYPO3\CMS\Core\Localization\Exception\InvalidXmlFileException;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -34,17 +33,12 @@ abstract class AbstractXmlParser implements LocalizationParserInterface
      */
     protected $languageKey;
 
-    /**
-     * @var string
-     */
-    protected $charset;
-
     /**
      * Returns parsed representation of XML file.
      *
      * @param string $sourcePath Source file path
      * @param string $languageKey Language key
-     * @param string $charset File charset
+     * @param string $charset File charset, not in use anymore and deprecated since TYPO3 v8, will be removed in TYPO3 v9 as UTF-8 is expected for all language files
      * @return array
      * @throws \TYPO3\CMS\Core\Localization\Exception\FileNotFoundException
      */
@@ -52,7 +46,6 @@ abstract class AbstractXmlParser implements LocalizationParserInterface
     {
         $this->sourcePath = $sourcePath;
         $this->languageKey = $languageKey;
-        $this->charset = $this->getCharset($charset);
         if ($this->languageKey !== 'default') {
             $this->sourcePath = GeneralUtility::getFileAbsFileName(GeneralUtility::llXmlAutoFileName($this->sourcePath, $this->languageKey));
             if (!@is_file($this->sourcePath)) {
@@ -68,21 +61,6 @@ abstract class AbstractXmlParser implements LocalizationParserInterface
         return $LOCAL_LANG;
     }
 
-    /**
-     * Gets the character set to use.
-     *
-     * @param string $charset
-     * @return string
-     */
-    protected function getCharset($charset = '')
-    {
-        if ($charset !== '') {
-            return GeneralUtility::makeInstance(CharsetConverter::class)->parse_charset($charset);
-        } else {
-            return 'utf-8';
-        }
-    }
-
     /**
      * Loads the current XML file before processing.
      *
diff --git a/typo3/sysext/core/Classes/Localization/Parser/LocalizationParserInterface.php b/typo3/sysext/core/Classes/Localization/Parser/LocalizationParserInterface.php
index 42abfe71fdd29069437fc44d0f4d8b69a3ed643c..91bc3ded70163fef5f8496727922588c6b102575 100644
--- a/typo3/sysext/core/Classes/Localization/Parser/LocalizationParserInterface.php
+++ b/typo3/sysext/core/Classes/Localization/Parser/LocalizationParserInterface.php
@@ -24,7 +24,7 @@ interface LocalizationParserInterface
      *
      * @param string $sourcePath Source file path
      * @param string $languageKey Language key
-     * @param string $charset Charset
+     * @param string $charset Charset, not in use anymore since TYPO3 v8, will be removed in TYPO3 v9 as UTF-8 is expected for all language files
      * @return array
      */
     public function getParsedData($sourcePath, $languageKey, $charset = '');
diff --git a/typo3/sysext/core/Classes/Localization/Parser/LocallangXmlParser.php b/typo3/sysext/core/Classes/Localization/Parser/LocallangXmlParser.php
index 71971ddc7977b9e3ccdf04df31207a1432eb779b..ff3a6780012ea8718cbd3859ab1af43d5cc8f3a1 100644
--- a/typo3/sysext/core/Classes/Localization/Parser/LocallangXmlParser.php
+++ b/typo3/sysext/core/Classes/Localization/Parser/LocallangXmlParser.php
@@ -36,14 +36,13 @@ class LocallangXmlParser extends AbstractXmlParser
      *
      * @param string $sourcePath Source file path
      * @param string $languageKey Language key
-     * @param string $charset Charset
+     * @param string $charset File charset, not in use anymore and deprecated since TYPO3 v8, will be removed in TYPO3 v9 as UTF-8 is expected for all language files
      * @return array
      */
     public function getParsedData($sourcePath, $languageKey, $charset = '')
     {
         $this->sourcePath = $sourcePath;
         $this->languageKey = $languageKey;
-        $this->charset = $this->getCharset($charset);
         // Parse source
         $parsedSource = $this->parseXmlFile();
         // Parse target
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Deprecation-80486-SettingCharsetViaLocalizationParserInterface-getParsedData.rst b/typo3/sysext/core/Documentation/Changelog/master/Deprecation-80486-SettingCharsetViaLocalizationParserInterface-getParsedData.rst
new file mode 100644
index 0000000000000000000000000000000000000000..d63b4db840e9be4efdcfde9cffed4bd1f7c0ed17
--- /dev/null
+++ b/typo3/sysext/core/Documentation/Changelog/master/Deprecation-80486-SettingCharsetViaLocalizationParserInterface-getParsedData.rst
@@ -0,0 +1,30 @@
+.. include:: ../../Includes.txt
+
+======================================================================================
+Deprecation: #80486 - Setting charset via LocalizationParserInterface->getParsedData()
+======================================================================================
+
+See :issue:`80486`
+
+Description
+===========
+
+The `LocalizationParserInterface->getParsedData()` contains a third parameter to hand over a value
+for the charset used.
+
+This third parameter has been marked as deprecated, as it is not in use anymore.
+
+
+Affected Installations
+======================
+
+Any installation with an extension that extends the LocalizationParser functionality with a custom
+PHP class implementing the `LocalizationParserInterface`.
+
+
+Migration
+=========
+
+If implementing the `LocalizationParserInterface`, be aware that this third parameter will be dropped in TYPO3 v9.
+
+.. index:: PHP-API
\ No newline at end of file