Fix division by 0 in sniper rifle training

Sniper rifle training: Fix missing victory sound, also disable controls at the end String freeze notice: This commit will display a caption with the string "Victory!". It does NOT violate the string freeze, as this string is already present in stub.lua.

Sniper rifle mission: Faster dynamite blow-up, also skip with precise

Sniper rifle training: Fix general camera weirdness - Camera bounced back and forth between shots - FollowGear was called every 20ms (way too often) - Now camera only re-centers when using sniper rifle - Camera also centers to dynamite once

Sniper rifle mission: Fix targets spawning twice in dynamite scenes, jacking up the total amount of targets

Fix small German typo

Fix GCC warnings: -Wimplicit-fallthrough and -Wint-in-bool-context

Fix PhysFS 3.0.0 deprecation warnings for error reporting

Fix compiler getting nervous about C++11 dependency

Update hedgewars_de.ts translation

Run lupdate $ lupdate QTfrontend -ts share/hedgewars/Data/Locale/*.ts

Update Big Armory mission image (duck position)

Fix first ammo row being invisible when there's only one weapon in the first row

Fix a few German typos and weird grammar

Update German Lua and campaign translations