undefined property $langs in SetupController

[diegosouza]

On the 2.4 branch I've run larastan with the following command:

php artisan code:analyse --level=0

Among many other problems, it shows:

 ------ ------------------------------------------------------------------------------------------- 
  Line   app/Http/Controllers/SetupController.php                                                   
 ------ ------------------------------------------------------------------------------------------- 
  143    Access to an undefined property CachetHQ\Cachet\Http\Controllers\SetupController::$langs.  
 ------ ------------------------------------------------------------------------------------------- 

Soon I'll provide a pull request for it.

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[diegosouza]

Here is my fix #3775