U4-11149 fixed error when creating new xslt file

[dawoe]

Prerequisites

• I have written a descriptive pull-request title
• I have linked this PR to an issue on the tracker at http://issues.umbraco.org/issue/U4-11149

Description

The create task was missing in the UI.xml file. Added it back now it works

[dawoe]

I just noticed this also when trying to create a new member group with the latest dev-v7 branch.
So maybe it has deeper underlying cause.

I see last commits in LegacyDialogHandler are done by @Shazwazza

Maybe he has an idea what is the cause ?

[dawoe]

The member groups not working is related to this commit by 0d2df4d by @RobertCopilau

It changed the namespace of MemberGroupsTask class

@nul800sebastiaan should i fix in this PR or should i create a seperate one ?

[dawoe]

Fixed the issue with membergroups in a seperate PR : #2545

[nul800sebastiaan]

This actually should be fixed in UI.Release.xml, which is the one we use when building Umbraco. I have no idea how this ever could have worked, doesn't seem like this part of the file has changed a lot in the last few years.

[dawoe]

I added it to the release.xml as well.

There have been some changes in the code that handles this. But could not track it down. Maybe it's because there are 2 node types in the xml to handle xslt files. One with alias initXslt and one with alias xslt

Dave

[nul800sebastiaan]

Cool! I'll merge it, not sure what happened but it seems like it hasn't worked for a long time.

I actually thought we were just hiding the XSLT tree if there was not files in the XSLT folder on disk :-)