Correct some strings

Change-Id: Ic019cb11b87cd51e7ffd1fb8f16b79dff381936c
Reviewed-on: https://gerrit.libreoffice.org/1508Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>