v6: Combobox is not localizable #43370

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

The text for selecting multiple items ("n selected") is hard-coded into the JavaScript code without the possibility to localise it. It should be settable via an options object passed to the constructor, a data- attribute, or some other method. (Whatever solution is chosen should allow for the possibility of the text to precede the number as well.)

I don't think there are very many components that have UI text, but there should be consistent, prominent documentation for localizing them. For example, the password strength indicator docs do show how to localize the labels, but only in the context of "how to pass a config object." IMO there should be a first-level localisation section on the page.

Reduced test cases

https://github.com/twbs/bootstrap/blob/main/js/src/combobox.ts#L1287

What operating system(s) are you seeing the problem on?

macOS

What browser(s) are you seeing the problem on?

No response

What version of Bootstrap are you using?

v6