fix two failing tests (#12964)

revert the original value to not disturb other tests:
the test change the property to "Jimmy" but other tests expect "Jim" (that is the original value)
(but we should not trust the value, and each test should check/set the value)

In locales other than the English one, the decimal separator may be not a dot

Change-Id: Ia8a509fca593ace1959d2d76b4115cc01c7b8b9e