Language update

Added different level of language preference functionaloty which can be
set from the new option in top navigation bar
Lanaguage preference can be set as
* System language (Default for all users)
* Session based   (User who are not logged in and want to see they
system in language of their choice can set their preference in browser
session)
* User lever (for authenticated users who have updated their language
preference, system will change into their selected language when they
log into the system)

app/Http/Controllers/Client/helpdesk/UnAuthController.php

@@ -19,6 +19,7 @@ use Hash;
 // classes
 use Illuminate\Http\Request;
 use Lang;
+use Session;
 
 /**
  * GuestController.
@@ -415,4 +416,30 @@ class UnAuthController extends Controller
             }
         }
     }
+
+    /**
+     * Function to chnage user language preference
+     *
+     * @param string $lang //desired language's iso code
+     *
+     * @category function to change system's language
+     *
+     * @return response
+     */
+    public static function changeUserLanguage($lang)
+    {
+        $path = base_path('resources/lang');  // Path to check available language packages
+        if (array_key_exists($lang, \Config::get('languages')) && in_array($lang, scandir($path))) {
+            if (\Auth::check()) {
+                $id = \Auth::user()->id;
+                $user = User::find($id);
+                $user->user_language = $lang;
+                $user->save();
+            } else {
+                Session::put('language', $lang);
+            }
+        }
+
+        return redirect()->back();
+    }
 }