[openstreetmap/openstreetmap-website] Fix dropdown widths for RTL languages (#2527)

[Andy Allan]

It looks like the width of the dropdowns isn't being correctly calculated for RTL display:

![Screen Shot 2020-01-30 at 13 57 09](https://user-images.githubusercontent.com/360803/73451713-8ed1df00-4368-11ea-96ac-c5c95d9dc958.png)

Eagle eyed viewers might also spot that the rounding on the button group is also incorrect.

Thanks to @mmd-osm for reporting.

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