Revert "[BUGFIX] Update all languages with CLI command"

This change was not necessary since multiple values can be passed in
separated by spaces instead of commas just like any other Symfony command.

Example:

    bin/typo3 language:update de ja

This reverts commit f612f2e.

Change-Id: Ie87d8245082613b4185b859f635bf712094ca914
Resolves: #85694
Releases: master
Reviewed-on: https://review.typo3.org/58137
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

typo3/sysext/install/Classes/Command/LanguagePackCommand.php

@@ -39,7 +39,8 @@ protected function configure()
         $this->setDescription('Update the language files of all activated extensions')
             ->addArgument(
                 'locales',
-                InputArgument::IS_ARRAY | InputArgument::OPTIONAL
+                InputArgument::IS_ARRAY | InputArgument::OPTIONAL,
+                'Provide iso codes separated by space to update only selected language packs. Example `bin/typo3 language:update de ja`.'
             );
     }
 
@@ -61,9 +62,9 @@ protected function execute(InputInterface $input, OutputInterface $output)
         }
 
         $languagePackService = GeneralUtility::makeInstance(LanguagePackService::class);
+
         try {
-            $localesToUpdate = $input->getArgument('locales');
-            $isos = GeneralUtility::trimExplode(',', $localesToUpdate[0], true);
+            $isos = $input->getArgument('locales');
         } catch (\Exception $e) {
             $isos = [];
         }