[openstreetmap/openstreetmap-website] Update gem, fix icons on RTL/Arabic pages (#1588)

[Andy Allan]

Thanks @mapmeld , that all looks good to me, and great to see the icons working. 

If you are able to translate more of that page into Arabic, or if you know someone else who can do the translation, then please see https://translatewiki.net/wiki/Translating:OpenStreetMap for more information!

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