- remove rtl prefix
- remove RTL_CONSTASCII_USTRINGPARAM
- correct some misspells

Change-Id: Ifd2eb59ff7d70fd3df42f063fcca781ef89b7d12
Reviewed-on: https://gerrit.libreoffice.org/1270Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>