Fixed incorrect variable name in npm script

Author: dmhendricks

package.json

@@ -10,7 +10,7 @@
     "prefix": "wpbp"
   },
   "scripts": {
-    "translate": "wp-pot -s 'app/**/*.php' -o ./languages/$npm_package_name.pot -p $npm_package_config_slug",
+    "translate": "wp-pot -s 'app/**/*.php' -o ./languages/$npm_package_name.pot -p $npm_package_name",
     "zip": "zip -q -r ../$npm_package_name.zip * -x 'node_modules/*' '.git*' './src/*' './.*' './package*.*' './composer.*' './*.md' './*.bak' './bower.json' './gulpfile.js' ",
     "zip-dev": "zip -q -r ../$npm_package_name.zip * -x 'node_modules/*' '.git*' '.DS_Store' './*.bak' "
   },