Fix old Rust woes

src/popover.rs

@@ -227,27 +227,27 @@ pub fn show(
         )
         .and_then(|lang| resources::get_layout_names(lang.as_str()));
 
-    let use_codes: Box<dyn FnMut(&str) -> Translation>
-        = Box::new(|name| Translation(name));
-
     let translated_names = all_layouts.iter()
-        .map(LayoutId::get_name)
+        .map(LayoutId::get_name);
-        // use a different closure depending on whether we have translations
+    let translated_names: Vec<Translation> = match translations {
-        .map(match translations {
         Some(translations) => {
-                let use_translations: Box<dyn FnMut(&str) -> Translation>
+            translated_names
-                     = Box::new(move |name| {
+                .map(move |name| {
                     translations.get(name)
                         .map(|translation| translation.clone())
                         .unwrap_or(Translation(name))
-                    });
+                })
-                use_translations
+                .collect()
         },
-            None => use_codes,
+        None => {
-        });
+            translated_names.map(|name| Translation(name))
+                .collect()
+        },
+    };
 
     // sorted collection of human and machine names
     let mut human_names: Vec<(Translation, LayoutId)> = translated_names
+        .into_iter()
         .zip(all_layouts.clone().into_iter())
         .collect();