Use coordinates2country instead of Geocoder in UploadMediaPresenter

[nicolas-raoul]

UploadMediaPresenter.java uses Geocoder in the reverseGeoCode method. This usage has several problems:

• Requires a geocoding backend such as Google Play Services, which is not always available and reliable (example).
• Apparently uses the network.
• Possibly a Wikimedia privacy violation, as Geocoder sends the user's picture location to a third-party service.

We already use a small offline geocoding library, it could be used for this too. We only need the country, not full address.

[DKolibar]

Hello @nicolas-raoul, may I take a look at this issue?

[nicolas-raoul]

@DKolibar Yes, it is yours, thanks!

[DKolibar]

@nicolas-raoul I created PR #5093 for this issue. I hope my implementation is as expected.