bugfix: Fix NPEs from BugSense

https://www.bugsense.com/dashboard/project/ad73db70#error/101833340
https://www.bugsense.com/dashboard/project/ad73db70#error/101132438
https://www.bugsense.com/dashboard/project/ad73db70#error/100675473
https://www.bugsense.com/dashboard/project/ad73db70#error/102012673
https://www.bugsense.com/dashboard/project/ad73db70#error/102126205
front: Added partial Turkish translation.