Add multilingual field exceptions

[wcedmisten]

Summary

Closes #9043

Adds exceptions for name:left, name:right, name:etymology, name:signed, and name:source when opening the multilingual tag.

Testing

Can be tested by adding these tags to a feature, and verifying that no multilingual field appears.

[1ec5]

Thanks for this contribution! I must admit I’m going to miss seeing the etymology displayed so prominently, which hopefully impressed mappers as to our thoroughness, but openstreetmap/id-tagging-schema#256 would be the more correct way to surface that information anyhow.

[1ec5]

This is a good start, though quite a few common non-language subkeys could be added to this list, either in this PR or in a followup. Off the top of my head, there’s also pronunciation,¹ prefix, and genitive.

To avoid a slow trickle of additions, perhaps we could match only the subkeys that follow the BCP 47 pattern. The following regular expression is similar to the one StreetComplete introduced in streetcomplete/StreetComplete@04fd11a, but it also covers country-specific subkeys, such as the Hong Kong and Taiwan variants of Traditional Chinese.

[a-z]{2,3}([A-Z][a-z]{3})?([A-Z]{2})?

Another syntax for transliteration is still in widespread use, for example name:ja_rm for romaji, but it’s deprecated, so we don’t need to go out of our way to support it.

/ref streetcomplete/StreetComplete#2723 (comment)

Footnotes

1. Technically, name:pronunciation should be name:*-fonipa, but no one is using that syntax. ↩

[wcedmisten]

@1ec5 Thanks for the feedback! This is my first time contributing here, so my initial approach was attempting to be more permissive of nonstandard tags, but I do agree restricting the locale matching would be a better approach.

With your feedback in mind, I've changed the regex to match on 2-3 letters, optionally followed by a hyphen and 4 letters.

This seems to match the streetcomplete commit you referenced.

My main question is if this is too disruptive to non-standard uses of name:<language>, that may not comply with this format. Again, I'm fairly new here, so not sure how to survey the usage of these tags, or what the etiquette is around changing that behavior. Let me know what you think. Thanks!