Issue reading documents from Google Drive with English (United Kingdom) language

[joshbrw]

Describe the Bug

When exporting a file out of Google Drive with the language set as English (United Kingdom), PHPWord cannot read the document and throws an error.

Steps to Reproduce

1. Create a file in Google Docs.
2. Set the Language to English (United Kingdom) (Under File > Language)
3. Use the following code to read the Doc and convert it to HTML:

<?php

require __DIR__ . '/vendor/autoload.php';

$phpWord = PhpOffice\PhpWord\IOFactory::load($_FILES['file']['tmp_name']);
$htmlWriter = new PhpOffice\PhpWord\Writer\HTML($phpWord);
$tempName = tempnam("/tmp", '');
$htmlWriter->save($tempName);

Expected Behavior

The document is correctly written as HTML.

Current Behavior

An InvalidArgumentException is thrown, with the message en_GB is not a valid language code.

Context

Please fill in your environment information:

• PHP Version: 7.2.25
• PHPWord Version: 0.17.0