Make project translatable

[Discostu36]

Before adding strings to the project, I need to make sure that these can be easily translated to other languages by contributors.

[Discostu36]

Further reading:

• https://developer.android.com/guide/topics/resources/string-resource
• https://developer.android.com/guide/topics/resources/localization.html

[Discostu36]

Sorry for creating these noob tickets, this is my first Android app.

Android has very good translation support, I don't have to worry about that.