Git: Replace string literal with constant

Change-Id: I457d69f1eac9810e2746d9f544151e421c147fac
Reviewed-by: Nikita Baryshnikov <nib952051@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git: Preserve author on cherry-pick

Change-Id: Ib3184631145ed6c6eb72dd5b7c33e415fc0cc799
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>