[Localization] {1 %} appears in the translation strings

[Oswald Buddenhagen]

On Wed, Jul 04, 2018 at 12:06:48AM +0200, scootergrisen wrote:
> Each time i update a translation to a new version i see a few {1 %} or 
> whatever it is.
> 
> Why are they there?
> 
i think that may be the number update heuristics. it's known to be
broken when multiple numbers appear in one string.

> And how can we make them not appear and change the translation strings?
>
fix the lupdate bug. patches welcome.