[TYPO3-core] RFC: #12827: Core labels need to be utf-8 before json_encode

[Steffen Kamper]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=12827

Branches:
trunk

This is same problem as 0012825 and 0012788. As json_encode only works 
with utf-8 the labels has to be converted if renderCharset is different.

This is for backend.php, other conversions are in the related RFCs

vg Steffen

btw: i remove a manual inclusion of Ext.BLANK_IMAGE_URL as this already 
is done in pageRenderer.
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