cleanup of localeCompare

[indirectlylit]

Observed behavior

In #3887 we added a new localeCompare wrapper

let's make sure that:

• we use it everywhere
• we pass in the correct locale, such that sorting occurs according to the user's currently-selected language
• we choose the correct usage parameter (sort vs search)

Expected behavior

proper sorting throughout the app, for all locales

User-facing consequences

perhaps unexpected sorting behavior

Context

0.10.0

[rtibbles]

Additional info here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/localeCompare

One thing of note, is that we should:

When comparing large numbers of strings, such as in sorting large arrays, it is better to create an Intl.Collator object and use the function provided by its compare property.

It also seems likely that our existing language codes should be able to be used as the locale argument.