Use the predefined $title variable in the anchor tag in grunion contact form button

CHANGE Use the predefined $title variable in the anchor tag in grunion contact form button added to the post editor scree
Unfortunately `esc_html` doesn't accept a domain argument and fetch translation strings, ([#](http://codex.wordpress.org/Function_Reference/esc_html)), even though `esc_html_e` does ([#](http://codex.wordpress.org/Function_Reference/esc_html_e)).

This would need to be changed to something like
```php
$title = esc_html__( 'Add Contact Form', 'jetpack'  );
```

to also translate the string.