I think there is missing backslash, so line 25 is triggering search of interface with FQN \Nette\Localization\Nette\Localization\ITranslator. In my project I am using only Latte and Utils. Autoloading is done by composer autoloader and after it is my second autoloader. My second autoloader tries to search for unexisting interface \Nette\Localization\Nette\Localization\ITranslator, because composer autoloader did not find such interface (I think it should be \Nette\Localization\ITranslator which is by composer autoload pointed to compatibility.php file).
I think there is missing backslash, so line 25 is triggering search of interface with FQN \Nette\Localization\Nette\Localization\ITranslator. In my project I am using only Latte and Utils. Autoloading is done by composer autoloader and after it is my second autoloader. My second autoloader tries to search for unexisting interface \Nette\Localization\Nette\Localization\ITranslator, because composer autoloader did not find such interface (I think it should be \Nette\Localization\ITranslator which is by composer autoload pointed to compatibility.php file).