[PATCH] Fix typo Wirter->Writer

l10n
#1

Dunno the right "path" to submit patch to translation,
so I send it to you.

Just for the record...
From the page:
https://translations.documentfoundation.org/km/
I have found a contact: Sokhem Khoem
From his page:
https://translations.documentfoundation.org/user/khem/
if I click on "his site" or "my site" (dunno english version)
I go here:
https://www.toptenthebestreviews.com/

and it seems something like spam...

Change-Id: I6f74fa5609d31b6e41fa73963ee8a850c00cb866