Fourth testing release

Produced the internationalisation CSV file ready for translations to be entered.
Added the social media sharing actions.
Removed debugging code that set the user label string.
Disabled all code that modified the users share option.
Added the explain data sharing screen and enabled only that screen to modified the users share option.
Configure the explain data sharing screen to always show before the game if the user has not agreed to share.
Reenabled the initial debug screen so that the testers can delete stored data.
Corrected an issue in the randomisation of game round samples.
Corrected an issue in the number of game round samples given so that it does not exceed the displayable limit of 5.
Corrected an issue with the display of users in the select user popup.
Modified the way unnamed users get displayed as anonymous.
Modified the share UI to remove the checkbox and add the unshare area only if the user has opted to share.
Added actions for the new and updated buttons on the start screen, tutorial, locale, info.
Prevented the switch player button being active when only one player is available.
Hid the language box from the user settings screen.
Modified the ChoosePlayerScreen so that the switch player button does not include the entire background area.
Added support for the SVG element "ellipse" which has been introduced with the new graphics.
Updated the randomised the location of the correct / incorrect sound samples in the guess round screen.
Added the new ExplainDataSharingScreen.
Added the updated SVG files.
Renamed the various "background" layers so that they each have a unique name.
Added the ExplainDataSharingScreen.
Randomised the location of the correct / incorrect sound samples in the guess round screen.
Set the current user as the selected item in the switch user popup.
Updated the application icon to the latest version from the designer.