Merge branch 'hotfix/fix_fallback_lng_seach' into 'release/2.3.0'

Fix search in fallback language

See merge request metamodels/core!321

src/Attribute/TranslatedReference.php

@@ -277,7 +277,18 @@ public function unsetDataFor($arrIds)
      */
     public function searchFor($strPattern)
     {
-        return $this->searchForInLanguages($strPattern, [$this->getActiveLanguage()]);
+        // Search at active language and return findings.
+        if ([] !== ($items = $this->searchForInLanguages($strPattern, [$this->getActiveLanguage()]))) {
+            return $items;
+        }
+
+        // Search at fallback language as alternative and return findings.
+        if ($this->getActiveLanguage() !== $this->getFallbackLanguage()) {
+            return $this->searchForInLanguages($strPattern, [$this->getFallbackLanguage()]);
+        }
+
+        // No finding in one language.
+        return [];
     }
 
     /**