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

* 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 

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.

cf. 36051879