fix calculation of LastRevisionAt

added debug prints to better figure out when LDAP has search issues.

Return valid xml when XML-RPC interface not enabled

Implemented interwiki substitution for external images (issue #1614).

Translation update (zh)

Translation update (sr)

Translation update (no)

currently phpseclib throws an error (about a deprecated function).
errors do not count as failures, so we can't skip them. so for now
7.1 testing is removed again.

DE translation for keys: update_name, update_mail

Usermanager/update lang de

DE translation for key 'protected'

Translation update (ro)

Translation update (no)

Translation update (no)

Translation update (no)

Translation update (no)

Translation update (no)

Translation update (no)

Translation update (ca)

Translation update (no)