chore: update version to 3.8.1 and enhance translations

- Bumped version number in package.json to 3.8.1.
- Added new translation keys for notifications and loading states in Spanish, Portuguese, and Russian.
- Improved UI elements in download group with updated styles for buttons and layout adjustments.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hydralauncher",
-  "version": "3.8.0",
+  "version": "3.8.1",
   "description": "Hydra",
   "main": "./out/main/index.js",
   "author": "Los Broxas",