Update translations mentioned in changelog

Finalize translation of pl.lua

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.

animation tweak

Fix incorrect check for cake gear type in ClimbHome

remove some more test redundancy and restore a missing and important nil check

just merging if statements

- Update .pro file - Rethink logic of TCPBase, fixes bug with failing to receive all bytes from engine when process end signal is received before tcp disconnect

Remove unused uCommands from uGearsHandlersMess

Fix lastGameType not being updated if game type was demo or save (fixes a crash) Previously, if you first played a normal game, then a demo, the “play again” button would appear, but clicking it would only crash HW. This fix will remove this button after a demo or save, because the frontend doesn't know how to restart demos or saves yet.

Fix desyncs when forcing rope re-selection after missing a shot or hitting bounce world edge Also re-introduce rope-reselection when touching ground

Fix desync when dropping weapon from parachute or jetpack

Backed out changeset 28210d2a9a36 (fixes bug #553) This fixes a desync when you take fall damage while roping and having a secondary ammo selected.

initialise previousGameState to something valid and not gsSuspend

Add Lua problems to the troubleshooting section of INSTALL.md

travis: Install qt4 with a brew tap

Don't send taunt message for automatically happening taunt animation

Remove newlines at end of Gravity mission panel

Fix frontend not sending script param if empty

Fix Battialion script showing “Round 0” at start

Fix host not re-sending ammo scheme after editing an existing ammo scheme This caused clients to start with an incompatible ammo loadout.

Update Polish tips and mission map descriptions

Update changelog regarding wrap world edge bugs

Add Polish translation for campaigns and new missions

Update pl.txt translation file

Backed out changeset c162995831d8

Backed out changeset 058a5d373e4a

Backed out changeset d08afea02908

Minor pl.txt update

Update and complete Polish frontend translation