web/settings: convert LanguageDropdown to universal SettingsDropdown

web/src/components/buttons/SettingsToggle.svelte

@@ -39,16 +39,14 @@
             updateSetting({
                 [settingContext]: {
                     [settingId]: !isEnabled,
-                },
-            })}
+                }
+            })
+        }
     >
         <h4 class="toggle-title">{title}</h4>
         <Toggle enabled={isEnabled} />
     </button>
-    <!--
-        description is repeated here because there may be several toggles per settings category,
-        and each of them needs its own description. this is intended. don't "clean it up".
-    -->
+
     {#if description}
         <div class="subtext toggle-description">{description}</div>
     {/if}