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

[Nick Doiron]

@gravitystorm thanks!

Based on my experience paying for translation into Dhivehi (which is how I stumbled on this issue), I might hire someone to continue translating into Arabic and Urdu in the future.  Still working on finding an OSM user who can help accept/verify their translations, though.

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