To avoid adding descriptions for each of font features cv** and
ss**, where ** is a number between 00-99, process them separately
and just use one description for each. This simplifies translation
as we don't need to add 99 copy-paste translations but add a bit
more complexity when looking up the descriptions.

Change-Id: Ia6e9554af20355c90c73afeec33fd18c694865b9
Reviewed-on: https://gerrit.libreoffice.org/56317
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>