Fix grunt errors

[rodica-andronache]

We need to be careful not to change strings and text domains, to not influence the wp.org translations

[rodica-andronache]

@cristian-ungureanu I got some warnings in the sidebar

Notice: Undefined index: before_widget in C:\wamp64\www\wordpress\wp-content\themes\amadeus\widgets\recent-comments.php on line 71

Notice: Undefined index: before_title in C:\wamp64\www\wordpress\wp-content\themes\amadeus\widgets\recent-comments.php on line 73

Notice: Undefined index: after_title in C:\wamp64\www\wordpress\wp-content\themes\amadeus\widgets\recent-comments.php on line 73

Notice: Undefined index: after_widget in C:\wamp64\www\wordpress\wp-content\themes\amadeus\widgets\recent-comments.php on line 87

http://prntscr.com/djr4pr

I think you should first check if those values exists, before using them

Also, please make sure you always create a pull request with your changes :)