1. Firstly, download XML file from here

2. Open strings.xml in your editor of choice (e.g. Notepad++)

3. Translate and keep in mind these important things.

4. Once you finished translating, save file named like values-<language code>, were <language code> is 2 letter ISO code of the language. For example values-es for Spanish, values-fr for French.

5. Translated XML file send to