Include top50 icon in beer and beerlisting

[andrepintado]

Beer should have top50 icons referring to:

1. a beer being present in the global top 50;
2. a beer being present in a country top 50;
3. a beer being present in a style top 50;

If the beer is a global top 50 beer, there's no need for the icon 2 and icon 3.

Icons could be present next to the "retired" and "alias" icons, in beer lists (brewery beer list, search results, ...)

[erickok]

Nice idea. We would need an offline list of the top 50 then, to be (infrequency) refreshed. The API doesn't provide this info.