Fix crash due to typo in Hebrew translation

https://bugzilla.gnome.org/show_bug.cgi?id=732401
Fix crash on startup

The last three keys were removed in
66a34214ea4a5cab3d9762e084c2968addf93aff so we need to iterate 9 times
instead of 12.

Also, the current code is triggering -Waggressive-loop-optimizations so
let's fix the data type to avoid undefined behavior.

https://bugzilla.gnome.org/show_bug.cgi?id=732401