[Form][Security][Validator] Normalize translation files

Author: nicolas-grekas

Loader/XliffFileLoader.php

@@ -111,6 +111,10 @@ private function extractXliff1(\DOMDocument $dom, MessageCatalogue $catalogue, s
                     continue;
                 }
 
+                if (isset($translation->target) && 'needs-translation' === (string) $translation->target->attributes()['state']) {
+                    continue;
+                }
+
                 $source = isset($attributes['resname']) && $attributes['resname'] ? $attributes['resname'] : $translation->source;
                 // If the xlf file has another encoding specified, try to convert it because
                 // simple_xml will always return utf-8 encoded values

Tests/fixtures/resources.xlf

@@ -18,6 +18,10 @@
         <target>with</target>
         <note>note</note>
       </trans-unit>
+      <trans-unit id="5">
+        <source>skipped</source>
+        <target state="needs-translation">skipped</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>