/**
  * Add words from:
  *   * $wgSpellCheckerExtraWordsGlobal
  *   * $wgSpellCheckerExtraWords(langcode)
  *   * MediaWiki:Dictionary message
  * to current dictionary (for this session only)
  */
 private function addExtraWords()
 {
     wfProfileIn(__METHOD__);
     $words = array();
     // add "global" extra words
     $words = array_merge($words, (array) $this->app->getGlobal('wgSpellCheckerExtraWordsGlobal'));
     // add "per language" extra words
     $variableName = 'wgSpellCheckerExtraWords' . ucfirst($this->lang);
     $words = array_merge($words, (array) $this->app->getGlobal($variableName));
     // add "per wiki: extra words (from MediaWiki:Dictionary)
     $localDictionary = Wikia::parseMessageToArray('dictionary', true);
     $words = array_merge($words, $localDictionary);
     // remove duplicated words
     $words = array_unique($words);
     //var_dump($words);
     if (!empty($words)) {
         foreach ($words as $word) {
             $this->dict->addWord($word);
         }
         $wordsCount = count($words);
         wfDebug(__METHOD__ . ": {$wordsCount} extra words added to the dictionary\n");
     }
     wfProfileOut(__METHOD__);
 }