MAGETWO-38202: Create skelton language uninstall command

- changed command argument description

Author: Ivan Gavryshko

app/code/Magento/Translation/Console/Command/UninstallLanguageCommand.php

@@ -93,7 +93,7 @@ protected function configure()
                 new InputArgument(
                     self::PACKAGE_ARGUMENT,
                     InputArgument::IS_ARRAY | InputArgument::REQUIRED,
-                    'Language code'
+                    'Language package name'
                 ),
                 new InputOption(
                     self::BACKUP_CODE_OPTION,