language switcher fix related to Core Security update.

Problem/Motivation

The core security update introduced with Drupal core 10.5.5, 9.5.5 and 9.4.12 requires changing the logic in the wxt_library to match how the core language switcher was changed.

https://www.drupal.org/sa-core-2023-003

Steps to reproduce

Upgrade to latest security release of Drupal 9.4.12 or 9.5.5 or 10.0.5 Drupal core as follows:
for wxt 4.4.2:
composer require drupal/core:'9.4.12 as 9.4.11'
OR for wxt 4.5.0
composer require drupal/core:'9.5.5 as 9.5.4'
OR for wxt 5.0.x
composer require drupal/core:'10.0.5 as 10.0.4'

Doing so will break the language switcher, the other language link will not appear unless a logic change is made either to core or to wxt_library.

Proposed resolution

See patch for wxt_library

Remaining tasks

See patch

User interface changes

N/A

API changes

see patch

Data model changes

N/A