Backed out
changeset 575c0de98505
Reason: We suspect that this patch might break Windows builds and render the mouse on Windows unusable.
This suspicion is based on the bug report of one user: https://hedgewars.org/node/6837#comment-33593
In return, this changeset will definitely re-introduce
bug #512.
Fix grammar fail in cosmos.lua (string freeze compliant)
This is string freeze compliant because the new string is already contained in stub.lua.
Update pl.lua (>99% complete)
A few strings have been removed because of empty translations of faulty format strings.