one more space is needed into a string

Moodle forms with required field display at its bottom right:
There are required fields in this form marked*.
A space between "marked" and the asterisk is missing.
It is only matter of changing the string
$string['somefieldsrequired']
of the file moodle20/lang/en/form.php
from

$string['somefieldsrequired'] = 'There are required fields in this form marked{$a}.';

to

$string['somefieldsrequired'] = 'There are required fields in this form marked {$a}.';