Add cuisine=british support (#2022)

Author: matkoniecz

data/fields/cuisine.json

@@ -80,6 +80,7 @@
             "argentinian": "Argentinian",
             "balkan": "Balkan",
             "bavarian": "Bavarian",
+            "british": "British",
             "ethiopian": "Ethiopian",
             "shawarma": "Shawarma",
             "persian": "Persian",