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
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
Added ability to use custom non-language string as first part (can be used for concatenating other strings)
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
 $ Adding installation languages : ro-RO and gd-GB
Merge remote-tracking branch 'remotes/upstream/master' into patch-9
 $ Removing deprecated lang strings for the flash Uploader
 # [#30488] Wrong default values for weblink icons in layout. Thanks
THomas Hunziker.
(Fix #957)
 #$ [#30381] Create Folder button label - Media Manager. Thanks Glenn
Arkell
(Fix #892)(Fix #891)
 #$ [#30618] *Adding filtering by Unprotected extensions in Extensions
Manager=>Manage
 # [#29922] Browser Agent Google Chrome on IOS. Thanks Brian Teeman.
(Fix #956)
 # [#30721] Removes unnecessary clearfix divs. Thanks Seth Warburton.
(Fix #1061)
 # [#30622] Queries not using JDatabase. Thanks Georges Wilson
Fix #1014)
 # [#30774] *SEF plugin issue. Thanks Robert Segura.
(Fix #1077)
 #$ [#30737] Incorrect title of the User Note Categories Manager
Fix system tests for clearfix class in front end