Covert license content to utf8

Author: JulianVennen

composer.json

@@ -12,6 +12,7 @@
     "require": {
         "php": ">=8.3",
         "ext-dom": "*",
+        "ext-mbstring": "*",
         "ext-yaml": "*",
         "league/html-to-markdown": "^5.1"
     },

composer.lock

@@ -33,9 +33,13 @@
 use Aternos\Licensee\TextTransformer\StripUrlTransformer;
 use Aternos\Licensee\TextTransformer\StripVersionTransformer;
 use Aternos\Licensee\TextTransformer\StripWhitespaceTransformer;
+use Aternos\Licensee\TextTransformer\TextTransformer;
 
 class LicenseText
 {
+    /**
+     * @var TextTransformer[]
+     */
     protected array $transformers;
     protected ?string $normalizedContent = null;
     protected ?array $wordSet = null;
@@ -101,7 +105,7 @@ public function __construct(
     public function getNormalizedContent(): string
     {
         if ($this->normalizedContent === null) {
-            $this->normalizedContent = $this->content;
+            $this->normalizedContent = mb_convert_encoding($this->content, 'utf8');
             foreach ($this->transformers as $transformer) {
                 $this->normalizedContent = $transformer->transform($this->normalizedContent);
                 $this->normalizedContent = RegExpException::handleNull(preg_replace("# +#", " ", $this->normalizedContent));