No functional change offered, but this reduces some amount of confusion.
Japanese word "Katakana" ("kata" + "kana") does not undergo Rendaku [1]
while "Hiragana" ("hira" + "kana") does.

[1] https://en.wikipedia.org/wiki/Rendaku

Change-Id: I07824147d72397c312a0774eca1fdcc7549abc59
Reviewed-on: https://gerrit.libreoffice.org/68661Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>