Fixed normal EXT-6853 ([HARDCODE] Number of "Person"/ "People" in World Map -...

Fixed normal EXT-6853 ([HARDCODE] Number of "Person"/ "People" in World Map - hard coded?) - added 2 UI strings: "world_map_person" and "world_map_people".
Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/290/

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branch : product-engine