add test mode button on main menu

Summary: add test mode button on main menu
how is it useful: this would be a page with extra setting to use in order to test the application, for now the only option would be: language
userId: 0bz6h4TFEedNDihtZvxMIfv16iB2
bugId: HIkEwoDu43ERXkjLW6Oo
username: Marijoselopez
firstName: Marijose
lastName: Lopez
Phone Make: apple
Bluetooth: denied
Location: granted