Changed the DJIA N/A message

to "DJIA not available". No need to use an abbreviation when there is
still plenty of screen space left.
Added localization.

Most UI strings are now in AppResources.resx. Still missing are:
* Tile text
* DatePicker labels (not sure if I can change that)
* Enum descriptions (settings: Map -, Geohash -, Coordinate Mode, Length Unit)
Removed language-specific text from Tiles.cs.

Base.dll can't have access to the AppResources, so I don't see a convenient or elegant way to localize the tile labels ("Geohash is at ..., Distance"), so I simply removed them.
Localized the text sent to the Maps app.
Localized the ListPicker texts on the Settings page.
Added german language (de-DE) support.
Improved auto-zoom - fixes #15.
Merge branch 'master' of github.com:lucaswerkmeister/wp_geohashing

Conflicts:
	App/SettingsPage.xaml