Added ability to add sprintf variables to JText string

[writing it up now...]
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
correcting com_tags.xml
[#30466] Tags: Not shown in contacts. Thanks Peter Bui.
 #$ [#30534] Missing Help Button in Joomla! Update component. Thanks
Mark Dexter
 # [#30538] Joomla Update Options button displays even if you don't have
permission. Thanks Mark
 # [#30532] Extension Manager -> Database not displaying Other
Information tab. Thanks Mark Dexter
 $ [#30511] Capitalise Custom output title (en-GB only). Thanks Brian
Teeman
(Fix #967)
 # [#30537] Menus with default view in URL and sub-tasks are missing in
other defined attributes and do not display correctly in menu type input
in backend. Thanks Beat
 # [#30446] Fix Strict warning 'Attribute already exists'. Thanks Piotr
Konieczny
(Fix #926)
 # [#30539] *Memcache cache time issue. Thanks Ofer Cohen and sajal soni
 # [#30154] Allow ability to upload file (eg: profile picture) through
com_users registration view. Thanks Cy Lee
(Fix #736)
[#30523] Fix Tag Batch Creation and Tag Library Cleanup. Thanks David
and Elin.
Fix com_tags install SQL file to add #__ucm_base table
Prepare for beta4 release
Fix unit test failures introduced in UCM refactoring
Resync MySQL and PostgreSQL DDLs and updates
Code style fixes
[#30553] jos_contentitem_tag_map error.