again)

This reverts commit ba09710a.

Conflicts:
	lib/plugins/authad/lang/de/settings.php

de/de-informal: config plugin - Clean up the TOC in the configuration page / No need to add "Konfiguration" or "Plugin" to every element if the heading tells you that.

paraphrased '<' character in some language files (en, de, de-informal) to avoid XML errors -- please fix other languages

added new strings

added new strings / typos fixed

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