[PHP-WEBMASTER] [web-php] PR #843: Update en.php

[alexwoollam]

Pull Request: https://github.com/php/web-php/pull/843
Author: alexwoollam

Added space after first period in main_subtitle
![image](https://github.com/php/web-php/assets/20298508/acdda0ab-77c5-4100-9828-2461500acc40)

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