All occurences of Slide Master and Master Pages are renamed to
Master Slide(s).

Change-Id: Idd75089f6c402b3d5e30a812b4c86aacc2f5d9bc
Reviewed-on: https://gerrit.libreoffice.org/40485Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>