Add gt.locale option

[olivroy]

Summary

The idea is to avoid stuff like this

---
title: "un document en français"
lang: fr
---

```{r}
options(gt.locale = "fr-CA")
```

```{r}
gt(exibble) |> fmt_number()
```

```{r}
gt(exibble)
```

.
Of course, if you provide locale explicitly anywhere in the calls, it would have precedence on the global option. Please let me know what you think. I see it as a useful way to specify locale globally in a Quarto document / project.

I hoped we could be smarter by detecting lang in Quarto, but it isn't possible. Let me know if you have an alternative idea! I know you are not a fan of global options

quarto-dev/quarto-cli#10886

Related GitHub Issues and PRs

Checklist

• I understand and agree to the Code of Conduct.
• I have listed any major changes in the NEWS.
• I have added testthat unit tests to tests/testthat for any new functionality.

[olivroy]

Motivated by this SO post https://stackoverflow.com/questions/78861704/how-to-change-the-language-of-gt-html-tables-in-quarto

[rich-iannone]

It actually seems like a sensible thing in this case! (So thanks for submitting this PR, will review soon.)

[rich-iannone]

LGTM!

[rich-iannone]

@olivroy now merged! Do you have an SO account to provide an update to that question? I don't think I do :/

[olivroy]

Yes! will do! thanks for merging