Fixed normal EXT - 6028 ( [HARD CODED]? Inventory > Library > \"Accessories\" folder)

Added localization string to the strings.xml for Accessories folder and localization support of Accessories folder from source code (llfolderviewitem.cpp).
<string name=\"InvFolder Accessories\">TRANSLATION TO THE CORRESPONDING LANGUAGE</string>  -- this string should be added to the strings.xml for each locale.

Note: due to Accessories category is created out of viewer & has the FT_NONE type it can not be localized as other protected (system) categories.
 So, hack was provided to check this folder (in a Library) & localize it.

Reviewd by Mike Antipov at https://codereview.productengine.com/secondlife/r/42/

--HG--
branch : product-engine