Use lazy properties in WikipediaApp. (#3352)
Use lazy properties in WikipediaApp. (#3352)

* Use lazy properties in WikipediaApp.

* Remove String type.

Co-authored-by: Cooltey Feng <e8fef604962fcdb72f55da9b018ef961a700112b@wikimedia.org>
Co-authored-by: Dmitry Brant <8475e3dec5ba18bb5016c01b67ac232315694532@wikimedia.org>
wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia