Issue #135
Merge remote-tracking branch 'upstream/develop' into savenewpack
Limiting extension package choice to non-core files
cs
cs
Allowing Import of package xml
correct empty display of New Extension package after Save
Update view.html.php
Merge pull request #161 from infograf768/importpackxml

Allowing Import of package xml
simplify. Thanks Achal
Merge pull request #158 from infograf768/savenewpack

Errors when saving new package (Issue #135)
Implementing Export of package xml
code style
Add an empty option if no custom translation exist in a client.
Merge pull request #1 from Achal-Aggarwal/empty-client

Add an empty option if no custom translation exist in a client.
Update extensiontranslations.php
Merge pull request #160 from infograf768/extensionfield

Limiting extension package choice to non-core files
Thanks Achal.
New string
Merge pull request #163 from infograf768/exportxml

Implementing Export of package xml
Adding the possible xx-XX.css file to core packages (admin)