[openstreetmap/openstreetmap-website] Add "Share location with marker" in map context menu (#1611)

[Holger Jeromin]

New Entry in context menu
![image](https://user-images.githubusercontent.com/2410353/29314713-8a006bda-81bf-11e7-94c7-f57ada0e99d8.png)
should lead to this prefilled screen
![image](https://user-images.githubusercontent.com/2410353/29314748-b16dca82-81bf-11e7-823c-eb6f3ce6f89a.png)


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