What does it mean {{ trans(core.text) }} in laravel? - laravel-5

I am new in Laravel and I am working on inbuilt project I have got {{ trans(core.text) }} after browse on internet I find that trans is a helper but I am not getting any file. So, Any one explain what does the line meaning {{ trans(core.text) }}.
Thank You

The trans function translates the given translation key using your localization files:
echo trans('messages.welcome');
If the specified translation key does not exist, the trans function will return the given key.
Link : https://laravel.com/docs/master/helpers

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