For monolingual content, set the languageID to the default language

Author: Cyperghost

wcfsetup/install/files/lib/system/form/builder/data/processor/MultilingualFormDataProcessor.class.php

@@ -133,18 +133,20 @@ private function removeMultilingualValues(array $parameters, array $languages):
      */
     private function processMonolingualValues(array $parameters): array
     {
-        $parameters[$this->arrayIndex][0] = [];
+        $defaultLanguageID = LanguageFactory::getInstance()->getDefaultLanguageID();
+
+        $parameters[$this->arrayIndex][$defaultLanguageID] = [];
         foreach ($this->fieldIds as $fieldId) {
             if (isset($parameters["data"][$fieldId])) {
-                $parameters[$this->arrayIndex][0][$fieldId] = $parameters["data"][$fieldId];
+                $parameters[$this->arrayIndex][$defaultLanguageID][$fieldId] = $parameters["data"][$fieldId];
                 unset($parameters["data"][$fieldId]);
             }
 
             foreach ($parameters as $key => $value) {
                 if (\str_starts_with($key, "{$fieldId}_")) {
                     $index = \substr($key, \strlen($fieldId) + 1);
 
-                    $parameters[$this->arrayIndex][0][$index] = $value;
+                    $parameters[$this->arrayIndex][$defaultLanguageID][$index] = $value;
                     unset($parameters[$key]);
                 }
             }

wcfsetup/install/files/lib/system/user/rank/command/SaveContent.class.php

@@ -52,7 +52,7 @@ private function saveContent(int $rankID, array $content): void
         $statement = WCF::getDB()->prepare($sql);
 
         foreach ($content as $languageID => $_content) {
-            $statement->execute([$rankID, $languageID ?: null, $_content['title']]);
+            $statement->execute([$rankID, $languageID, $_content['title']]);
         }
     }
 }