Disallow changing the languageCode of existing languages

Changing the language code for an existing language effectively invalidates
everything that is already stored within that language and thus is not a useful
operation. Changing the country code or locale should be compatible with
existing phrases or contents and thus is still allowed.

diff --git a/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php b/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php
index 424044bb272af27cf860cb1efa2d602ca3122241..680e228ceb5b9d16a48fa6f7da6fa623f3d9b3e7 100644 (file)
--- a/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php
+++ b/wcfsetup/install/files/lib/acp/form/LanguageAddForm.class.php
@@ -97,6 +97,7 @@ class LanguageAddForm extends AbstractFormBuilderForm
                         ->description('wcf.acp.language.code.description')
                         ->maximumLength(20)
                         ->required()
+                        ->immutable($this->form->getFormMode() === IFormDocument::FORM_MODE_UPDATE)
                         ->addValidator(new FormFieldValidator('unique', function (TextFormField $formField) {
                             if ($formField->getValidationErrors() !== []) {
                                 return;