ldraw_org/parse.rb: Use categories "LDraw #{part_category}"
ldraw_org/parse.rb: Use categories "LDraw #{part_category}"

Also using the linguistics gem to pluralize the category names.

An example: "LDraw Animals"

samskeller/zeroclickinfo-fathead,dankolbrs/zeroclickinfo-fathead,dankolbrs/zeroclickinfo-fathead,nikhilsingh291/zeroclickinfo-fathead,thinker3197/zeroclickinfo-fathead,thinker3197/zeroclickinfo-fathead,souravbadami/zeroclickinfo-fathead,nikhilsingh291/zeroclickinfo-fathead,dankolbrs/zeroclickinfo-fathead,p12tic/zeroclickinfo-fathead,rasikapohankar/zeroclickinfo-fathead,samskeller/zeroclickinfo-fathead,rasikapohankar/zeroclickinfo-fathead,samskeller/zeroclickinfo-fathead,p12tic/zeroclickinfo-fathead,souravbadami/zeroclickinfo-fathead,souravbadami/zeroclickinfo-fathead,samskeller/zeroclickinfo-fathead,p12tic/zeroclickinfo-fathead,thinker3197/zeroclickinfo-fathead,thinker3197/zeroclickinfo-fathead,nikhilsingh291/zeroclickinfo-fathead,p12tic/zeroclickinfo-fathead,thinker3197/zeroclickinfo-fathead,rasikapohankar/zeroclickinfo-fathead,rasikapohankar/zeroclickinfo-fathead,p12tic/zeroclickinfo-fathead,rasikapohankar/zeroclickinfo-fathead,souravbadami/zeroclickinfo-fathead,samskeller/zeroclickinfo-fathead,nikhilsingh291/zeroclickinfo-fathead,rasikapohankar/zeroclickinfo-fathead,dankolbrs/zeroclickinfo-fathead,souravbadami/zeroclickinfo-fathead,p12tic/zeroclickinfo-fathead,nikhilsingh291/zeroclickinfo-fathead,souravbadami/zeroclickinfo-fathead,thinker3197/zeroclickinfo-fathead,dankolbrs/zeroclickinfo-fathead,samskeller/zeroclickinfo-fathead,dankolbrs/zeroclickinfo-fathead,nikhilsingh291/zeroclickinfo-fathead