[openstreetmap/openstreetmap-website] Add OpenLocationCode to OSM website (#1807)

[Lukas Sommer]

@ppKrauss As far as I see, the [official definition for OLC short codes](https://github.com/google/open-location-code/blob/master/docs/olc_definition.adoc#shortening-open-location-codes)

- works with a “nearest-reference-point” approach
- is intrinsic ambiguous to the same degree as the mentioned reference point is ambiguous (imagine you take “Springfield” as reference – there are quite a few of them on our planet).
- the official OLC definition is quite, well, vague. So you can use any geo-coder you like. And it’s on your own how this geo-coder interpretates city or country names. Particularly, to be in line with the OLC definition, it is **not** required to return the same results for geo-coded short codes as Google does for their own services. Results based on Nominatium would be as valid as results based on Googles geo-coding are.

OLC long codes however are unambigous.

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