style: apply cargo fmt across workspace

src/i18n.rs

@@ -169,7 +169,9 @@ fn system_languages() -> Vec<i18n_embed::unic_langid::LanguageIdentifier> {
     // them — not even from a test that runs in parallel.
     #[cfg(test)]
     {
-        vec!["en-US".parse().expect("en-US is a valid language identifier")]
+        vec!["en-US"
+            .parse()
+            .expect("en-US is a valid language identifier")]
     }
 
     #[cfg(not(test))]