Load translation inside lifecycle function

[moorscode]

Otherwise the textdomain is not available yet and the text will not be translated. Resolves the "textdomain 'yoast-components' not found"

Summary

This PR can be summarized in the following changelog entry:

• N/A

Relevant technical choices:

*

Test instructions

This PR can be tested by following these steps:

• Load a post-edit page and see no error about the textdomain appear.
• The text should be translated in the metabox readability analysis section

Fixes #

[abotteram]

I made some changes to make sure texts are not unnecessarily translated.

[moorscode]

I made some changes to make sure texts are not unnecessarily translated.

These are not optimizations that matter. The translations are just in a long list (key->value), so retrieving an item from that list does not do any "translating" at all.

[andizer]

CR done 👍

[Dieterrr]

I cannot reproduce the "error about the textdomain" but everything works as it should in the PR.

So, acceptance done 👍