Also search for "en" as a final fallback language to find a displayable
name should such a name not be found in the current language and the
default language.

When we remove old templates we can also remove silk.

The former is no longer online.

There's a link straight above to the docs, a link to the rest
of the website in the footer, this paragraph is highly redundant.
It links to rnd.feide.no which is down.

This is likely way more informative for the average person
clicking the link - and linking directly to github only
stimulates people asking help questions in issue tracker.

Fix new UI

Do not enable complementary functionality by default

In the ldap-code, search.attributes can be either a string (single attribute) or an array of attributes... The negotiate attr-setting is equal to search.attributes, but was handled differently (as merely a string)

PasswordProtectedTransport authncontext when HTTPS

Add docs for saml:AuthnContextClassRef filter

Following up on the idea mentioned in #937: If the transport is secure fall back to the `PasswordProtectedTransport` authn context class ref, otherwise keep the current default of `Password`.

Requires a version of the SAML2 library with simplesamlphp/saml2#129 merged due to the reference on a newly defined Constant.

Fix for #933

`stream_context_create` functionality is handled with HTTP::fetch()

Add initial support for SAML Subject Id Attributes

The OASIS spec [SAML V2.0 Subject Identifier Attributes Profile](https://wiki.oasis-open.org/security/SAMLSubjectIDAttr) defines two new standard attributes intending to replace use of persistent NameIDs and the eduPersonTargetedID and eduPersonUniqueId SAML attributes. The updated Kantara [SAML V2.0 Interoperability Deployment Profile](https://kantarainitiative.github.io/SAMLprofiles/saml2int.html) will also standardize on these new attributes (cf. SDP-SP15 ibid.).

This commit adds the two new attributes:

* to the URN attribute maps
* to attribute definitions and translations of the locale system
* to the smartattributes:SmartID auth proc filter (after any other SAML attributes, but before the non-SAML ones).

Support for saml2int SDP-SP16 (attribute requirements signalling via Entity Attributes) is not included here.

Upgrade gettext to latest version

Make sure that session is closed and only then update cookie params

Add missing catalan language

Update config.php
Update header.php