Unable to load .mo files due to incorrect conversion of Locale to a List of language names

[DI84]

Description

The method "_locales_to_names()" from the "Translations" class (babel/support.py) does not correctly convert a given Locale to a List of language names.

Instead of calling str() on the parameter variable locales (note the -s), it is called on the module object locale (without -s) if the parameter variable locales is an instance of Locale (see code below) .

def _locales_to_names(
    locales: Iterable[str | Locale] | str | Locale | None,
) -> list[str] | None:
    """Normalize a `locales` argument to a list of locale names.

    :param locales: the list of locales in order of preference (items in
                    this list can be either `Locale` objects or locale
                    strings)
    """
    if locales is None:
        return None
    if isinstance(locales, Locale):
        return [str(locale)]
    if isinstance(locales, str):
        return [locales]
    return [str(locale) for locale in locales]

The 4th lowest line should read return [str(locales)] instead of return [str(locale)] (as in locale the module object).

As a result, the gettext.find() call in the load method of the Translations class does not return a valid .mo file path and therefore the translations cannot be loaded.

[inabout]

@akx: This is an important bug for us in the current version 2.13.0. Would it be possible to release a 2.13.1 as soon as a fix for this is available?

[DI84]

This PR would fix it: #1038

[akx]

Oops, great catch. Will release a patch version soon...

[akx]

Fixed in https://github.com/python-babel/babel/releases/tag/v2.13.1. Sorry for the inconvenience and thanks for spotting and fixing the issue.