Override the locale string UF provides to a legal language identifier [ZN-MDD-14]

src/ServicesProvider/ServicesProvider.php

@@ -18,6 +18,7 @@ use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use UserFrosting\Sprinkle\Core\Log\MixedFormatter;
 use UserFrosting\Sprinkle\UFTweaks\Twig\HasRoleExtension;
+use UserFrosting\Sprinkle\UFTweaks\Twig\LocaleOverrideExtension;
 use UserFrosting\Sprinkle\UFTweaks\Twig\MobileDetectExtension;
 use UserFrosting\Sprinkle\UFTweaks\Mail\RetryMailer;
 
@@ -185,6 +186,7 @@ class ServicesProvider
 
             $twig->addExtension(new HasRoleExtension($c));
             $twig->addExtension(new MobileDetectExtension($c));
+            $twig->addExtension(new LocaleOverrideExtension($c));
 
             return $view;
         });

src/Twig/LocaleOverrideExtension.php

@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * AVSDev UF Tweaks (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-uf-tweaks
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-uf-tweaks/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\UFTweaks\Twig;
+
+use Psr\Container\ContainerInterface;
+use Twig\Extension\AbstractExtension;
+use Twig\Extension\GlobalsInterface;
+
+/**
+ * Overrides the page language to 'en' only
+ */
+class LocaleOverrideExtension extends AbstractExtension implements GlobalsInterface
+{
+    /**
+     * @var ContainerInterface
+     */
+    protected $services;
+
+    /**
+     * @var Config
+     */
+    protected $config;
+
+    /**
+     * @param ContainerInterface $services
+     */
+    public function __construct(ContainerInterface $services)
+    {
+        $this->services = $services;
+    }
+
+    /**
+     * Adds Twig global variable 'currentLocale'
+     *
+     * @return array[mixed]
+     */
+    public function getGlobals(): array
+    {
+        $locale = $this->services->locale->getLocaleIndentifier();
+        $parts = explode('_', $locale) ?: [];
+        return [
+            'currentLocale' => $parts[0]
+        ];
+    }
+}