l10n: Do not show fuzzy, unfinished strings to the user

It seems that our hand-crafted lconvert/lupdate/lrelease toolchain was
accidentally using fuzzy strings in the user-facing UI. That's bad.

Thanks to <onli@paskuda.biz> for reporting this.

BUG: 359021
Change-Id: I7e31eb92f17d2535f9803122c20bb8a2c8c1c2e2