Add Support for Multiple Languages

To make VirtualDyno accessible to a wider audience, we need to translate the app's interface into Spanish, French, and German. Currently, the app only supports Italian and English.

**Tasks**:

- Create/Update translation files in the /assets/languages (or /locales) folder.
- Provide accurate translations for technical terms like "Torque", "Curb Weight", "Drag Coefficient", and "Gear Ratios".
- Ensure the UI handles longer word lengths (e.g., German words can be significantly longer than Italian ones).

**How to contribute**:

1. Locate the existing en.json or it.json file.
2. Create a new JSON file for the language you wish to add (e.g., es.json).
3. Translate the values while keeping the keys identical.
4. Open a Pull Request!

Start by locating the existing en.json or it.json under assets/languages or locales and inspect how the interface loads translation files. Add Spanish, French, and German files with identical keys, translate the listed technical terms, and verify that longer German labels remain usable in the UI.

Written by the indexing model from the issue text.