Can restore state on rotate personal dict screen

When adding/editing a word for your personal dictionary
rotating the screen could cause the language to change
back to the device default. This has been fixed.

Test: ag/1389633, robolectric not supported in this branch.
Bug: 30874931
Change-Id: I0c8ebec5f4d5e7b23112b656c482c3b2cda7791f