Created attachment 5563 patch
Sergey Alyoshin referenced this bugreport in commit 63f7ecdedc5e309b88abfa88fe1386dbdc250151 Add string to translation (Bug #11049) https://git.xfce.org/apps/mousepad/commit?id=63f7ecdedc5e309b88abfa88fe1386dbdc250151
Merged, thanks