Now that we have a theme, we can change the text.
In this example we're going to change the text * Required information.
To do this we'll create the folder structure below and inside it create a file named custom.php
Inside our custom.php file, we add the below:
<?php$_['lang_text_required'] = '* Mandatory';?>
How did we know to use the term 'lang_text_required' above? By using the 'Tools -> Text Finder' admin feature.
We can add as many language strings to this file as we like. And the final result ...