[openstreetmap/openstreetmap-website] Add dir=auto to text inputs (PR #3430)

[Andy Allan]

> we would need to be able to override it when we don't want it.

Yep. I expect if there was a default set via the rails helpers it would still be overridden by the options hash when the helper is used, so we can add the `dir` to the one or two cases that need it (basically the inverse of what we have here).

> (latitude and longitude for user positions for example)

text_fields used for numbers should be fine, since with dir="auto" they are actually better laid out for negative numbers than currently. In dir="rtl" the negative sign is shown to the right (before) the number, but in arabic the [negative should be shown to the left](https://en.wikipedia.org/wiki/Modern_Arabic_mathematical_notation). Both dir="auto" and dir="ltr" do the right thing here.

(If anyone has a contra-example for an RTL language that shows regular numerals differently, then I'd love to hear about it - I can't speak or read any RTL languages myself so my knowledge is limited to what I read online).

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