License string corrected

Correct license abreviation is CC BY-SA 3.0.
(per https://creativecommons.org/licenses/by-sa/3.0/)
Affects:
* edit_save_action_license_logged_in
* edit_save_action_license_anon

Spotted by Jopparn at https://translatewiki.net/wiki/Thread:Support/About_Wikimedia:Wikipedia-android-strings-edit_save_action_license_logged_in/sv

Change-Id: I50286b6afde9e88c092b15790baaadf3ab0796b6
Merge "License string corrected"