We can remove several tags, login:processing and admin:metaconv_selectfile, and
replace several others with their English text.

* locales/de: Fix several wording, typo and grammar mistakes

* Fix typo

Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

* Remove deprecated classes

* Remove support for certificate fingerprints

* Remove many deprecated methods and pieces of code

* Remove SAML1.1/Shib1.3 support

* Remove many superfluous annotations

* Update unit test to work with new PHPunit

Closes #1268 
Closes #1020 
Closes #431 
Closes #167 
Closes #151 

Fix Japanese translations

* Fixes in the cs locale

We have moved those translations (and more that were missing) to their own specific files, which makes it easier to manage them automatically. Then it no longer makes sense to keep these entries in the general translation files.

All the old LC_MESSAGES content from the old
preprodwarning module will have to be added...

- Translations to other languages needed

cf. 36051879