Replace unmaintained lexical-sort with ICU

src/localize.rs

@@ -1,9 +1,13 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
+use std::str::FromStr;
+
 use i18n_embed::{
     fluent::{fluent_language_loader, FluentLanguageLoader},
     DefaultLocalizer, LanguageLoader, Localizer,
 };
+use icu_collator::{Collator, CollatorOptions, Numeric};
+use icu_provider::DataLocale;
 use rust_embed::RustEmbed;
 
 #[derive(RustEmbed)]
@@ -22,6 +26,23 @@ lazy_static::lazy_static! {
     };
 }
 
+lazy_static::lazy_static! {
+    pub static ref LANGUAGE_SORTER: Collator = {
+    let mut options = CollatorOptions::new();
+    options.numeric = Some(Numeric::On);
+
+    DataLocale::from_str(&LANGUAGE_LOADER.current_language().to_string())
+            .or_else(|_| DataLocale::from_str(&LANGUAGE_LOADER.fallback_language().to_string()))
+            .ok()
+            .and_then(|locale| Collator::try_new(&locale, options).ok())
+            .or_else(|| {
+                let locale = DataLocale::from_str("en-US").expect("en-US is a valid BCP-47 tag");
+                Collator::try_new(&locale, options).ok()
+            })
+            .expect("Creating a collator from the system's current language, the fallback language, or American English should succeed")
+        };
+}
+
 #[macro_export]
 macro_rules! fl {
     ($message_id:literal) => {{