private function _initLanguageArrays()
{
$this->_scanningProject();
$languageSources = LanguageSource::find()->all();
foreach ($languageSources as $languageSource) {
if (isset($this->_languageElements[$languageSource->category][$languageSource->message])) {
unset($this->_languageElements[$languageSource->category][$languageSource->message]);
} else {
$this->_removableLanguageSourceIds[$languageSource->id] = $languageSource->id;
}
}
}