Rename 'Other Wall' to 'Inner Wall'
Rename 'Other Wall' to 'Inner Wall'

This is both more correct and more consistent with the descriptions.

Contributes to issue CURA-1212.

totalretribution/Cura,senttech/Cura,senttech/Cura,ynotstartups/Wanhao,Curahelper/Cura,hmflash/Cura,Curahelper/Cura,hmflash/Cura,ynotstartups/Wanhao,totalretribution/Cura,fieldOfView/Cura,fieldOfView/Cura