EXT-8425 ADDITIONAL FIX Fixed broken translation of accelerators which was...

EXT-8425 ADDITIONAL FIX Fixed broken translation of accelerators which was introduced by fix of this bug in changeset 14331:11122e1fc5cf.

Removed "Key_" prefix from new key strings and from function that finds them, because it broke translation of old accelerator strings.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/861/

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branch : product-engine