BUG: PHP Notice: Function _load_textdomain_just_in_time was called incorrectly

[felipeelia]

Describe the bug

In #4036 we've delayed the load_plugin_textdomain call to the init action. Next, we must push some *__() calls to be done after that action.

That means that Feature and Indexable classes can not call i18n functions in their __construct methods, so we'll need to come up with a different way to set all labels and titles.

Steps to Reproduce

Using a different language in wp-admin and having WP_DEBUG on and no other plugin enabled, you should be able to see all the notices.

Screenshots, screen recording, code snippet

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Environment information

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WordPress and ElasticPress information

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