Merge branch 'hotfix/#6322-change-xmlrpc-unknown-error-message' into develop

Close #6322
Add failing test to Number element
Fix invalid use of Float validator in favor of Regex validator
Additionally test and allow for negative values in Regex pattern
Fix stupidly slipped in character... this can really only happen ony german keyboard layout
Merge branch 'hotfix/#6326-thousand-separator-in-number-validator'

Close #6326
Merge branch 'hotfix/#6326-thousand-separator-in-number-validator' into develop

Forward port #6326
Fixes link media type list for iana and wikipedia
Merge branch 'cleanup/#6336-link-mediatype-references'

Close #6336
Merge branch 'cleanup/#6336-link-mediatype-references' into develop

Forward port #6336
update de translation header
Merge branch 'hotfix/#6351-license-header'

Close #6351
Merge branch 'hotfix/#6351-license-header' into develop

Forward port #6351
Fixes #6281
change == to ===
move logic into __construct
Merge branch 'hotfix/#6361-fix-#6281-mongodb-saveoptions-not-recognized'

Close #6361
Close #6281
Merge branch 'hotfix/#6361-fix-#6281-mongodb-saveoptions-not-recognized' into develop

Forward port #6361
Remove trailing whitespaces
Remove trailing whitespaces

Conflicts:
	library/Zend/Cache/Storage/Adapter/Redis.php
	library/Zend/Crypt/FileCipher.php
	tests/ZendTest/Crypt/FileCipherTest.php
	tests/ZendTest/Crypt/Symmetric/Padding/NoPaddingTest.php