check if google play store is installed before trying to start it

Change-Id: I355302b7a690b9536d91eceff1799d249527c13e
translations: add PT-BR, update translations

Change-Id: Id19f28c6d9946c2340a76479d8dca8b60755ac30
version: 0.5.5

Change-Id: Ic04e8f9500f7c86c379e7a36e710708952a7aad7