Bug: MessageFormatter argType of "String" isn't valid

[HughieW]

Direction
System/Language/Language.php uses PHP's MessageFormatter class for international support. In some cases, an argType of "string" is used, which is not a valid argType. An example is in System/Language/en/Email.php, line 26. This came to light for me when trying to simply send an email, which did send, but threw an error trying to log the success message. Having done some testing, I found this error, simply removing the "string" from the type fixes it. Looking through the language files, there are very few instances where this appears

CodeIgniter 4 version
4.0.2

Affected module(s)
System/Language/en/*.php

Context

• OS: Ubuntu 20.04
• Web server: Apache 2.4
• PHP version: 7.4.7