CA: Use two-letter language code for translation folders

sourcecode/apis/contentauthor/app/Http/Middleware/LtiLocale.php

@@ -2,10 +2,10 @@
 
 namespace App\Http\Middleware;
 
-use Illuminate\Support\Facades\App;
+use App\H5pLti;
 use Closure;
+use Illuminate\Support\Facades\App;
 use Illuminate\Support\Facades\Session;
-use App\H5pLti;
 
 class LtiLocale
 {
@@ -23,11 +23,28 @@
         $ltiRequest = $this->h5pLti->getValidatedLtiRequest();
         if ($ltiRequest != null) {
             if ($ltiRequest->getLocale()) {
+                // Store the original code, even if we don't have this locale, maybe H5P does
                 Session::put('locale', $ltiRequest->getLocale());
             }
         }
-        App::setLocale(Session::get('locale', config('app.fallback_locale')));
+        App::setLocale($this->resolveLocale(Session::get('locale', config('app.fallback_locale'))));
 
         return $next($request);
     }
+
+    /**
+     * Check if we have a translation for the code. If that failes, and a code longer than two characters is
+     * given, check if we have a translation for the two-code version. Failing that the original code is returned.
+     */
+    private function resolveLocale(string $locale): string
+    {
+        if (!file_exists(resource_path('lang/' . $locale)) && strlen($locale) > 2) {
+            $lang = \Iso639p3::code2letters($locale);
+            if (file_exists(resource_path('lang/' . $lang))) {
+                return $lang;
+            }
+        }
+
+        return $locale;
+    }
 }

sourcecode/apis/contentauthor/app/Libraries/H5P/H5PConfigAbstract.php

@@ -8,6 +8,7 @@
 use App\Libraries\H5P\Interfaces\ConfigInterface;
 use App\Libraries\H5P\Interfaces\H5PAdapterInterface;
 use Illuminate\Support\Facades\Session;
+use Iso639p3;
 use Ramsey\Uuid\Uuid;
 
 use function Cerpus\Helper\Helpers\profile as config;
@@ -272,22 +273,28 @@
         }
     }
 
+    /**
+     * Language file to load for H5P Editor
+     */
     private function getLanguage(): string
     {
-        $preferredH5PLanguage = LtiToH5PLanguage::convert(Session::get('locale'));
-
-        if ($this->languageFileExists($preferredH5PLanguage)) {
-            return "language/$preferredH5PLanguage.js";
-        }
-
-        return 'language/en.js';
+        return "language/" . $this->resolveEditorLocale(Session::get('locale')) . ".js";
     }
 
-    private function languageFileExists($preferredLanguage): bool
+    private function resolveEditorLocale($locale): string
     {
-        $path = base_path('vendor/h5p/h5p-editor/language/' . $preferredLanguage . '.js');
+        if (is_string($locale)) {
+            if (file_exists(base_path('vendor/h5p/h5p-editor/language/' . $locale . '.js'))) {
+                return $locale;
+            } elseif (strlen($locale) > 2) {
+                $lang = Iso639p3::code2letters($locale);
+                if (file_exists(base_path('vendor/h5p/h5p-editor/language/' . $lang . '.js'))) {
+                    return $lang;
+                }
+            }
+        }
 
-        return file_exists($path);
+        return 'en';
     }
 
     private function getL10n(): array