Add linked data array to JSON tags API.
Add linked data array to JSON tags API.

Example: http://world.productopener.localhost/categories.json
`{"count":4,"tags":[{"id":"en:pizza-with-ham-and-cheese","name":"Pizza
with ham and
cheese","products":1,"url":"http://world.productopener.localhost/category/pizza-with-ham-and-cheese"},{"id":"en:pizzas","name":"Pizzas","linkeddata":{"wikidata:en":"Q177"},"products":1,"url":"http://world.productopener.localhost/category/pizzas"},{"id":"en:pizzas-pies-and-quiches","name":"Pizzas
pies and quiches","linkeddata":{"pnns_group_2:en":"Pizza pies and
quiche"},"products":1,"url":"http://world.productopener.localhost/category/pizzas-pies-and-quiches"},{"id":"en:meals","name":"Meals","linkeddata":{"pnns_group_2:en":"One-dish
meals"},"products":1,"url":"http://world.productopener.localhost/category/meals"}]}`

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