UI changes for LO-5.0 - review needed

[Zolnai Tamás]

Hi guys,

I submit two patches to gerrit related to text highlighting:
First one renames all instances of character "Background" to "Highlighting":
https://gerrit.libreoffice.org/#/c/16322/
Second one adds a Highlighting Tab to paragraph styles dialog, because
in the LO-4.4 release we lost the functionality of setting character
background for paragraph styles:
https://gerrit.libreoffice.org/#/c/16324/

I would need review from the UX side. I hope it can get into the 5.0
branch before the UI freeze.

Thanks,
Tamás