Fixed normal task EXT-6021 [HARD CODED] Bubble shown when you mouseover on...

Fixed normal task EXT-6021 	[HARD CODED] Bubble shown when you mouseover on script within Contents is in EN (task inventory)
* Added new string name="PanelContentsTooltip into strings.xml
* Set this tooltip to LLFolderView inside the Build Tool

Note: Fix for localization of default "New Script" name will be fixed in the EXT-5839.

Reviewed by Richard Nelson at https://codereview.productengine.com/secondlife/r/43/

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branch : product-engine