Add function to retrieve translation key

inc/Translator.php

@@ -98,6 +98,11 @@ class Translator extends PhpObject
 		return $asPageToHash;
 	}
 
+	public function getTranslationKey($stransText, $sLang='') {
+		if($sLang=='') $sLang = $this->sLang;
+		return array_search($stransText, $this->asTranslations[$sLang]) ?? '';
+	}
+
 	private function loadLanguages()
 	{
 		//List all available languages