use 0s instead of nils to try to protect script assumptions

only-stats should never create visual gears. and lua should never rely on visual gears being created. critical is just to help ensure ones important to gameplay don't get lost in fast-forward

Remove unused shockwave code in Space Invasion

Make decorational visual gears in Space Invasion non-critical

Update German translation

Update locale files

Merge unC0Rr's checker update

Add a few translator comments for frontend strings

Consistently rename "team chat" to "clan chat" (except chat command) Only change in strings, no functional change. "Team" and "clan" have defined meanings in HW, but "team chat" oddly broke this convention. This feature allows chat with your clan, not with your team, so is now called "clan chat". /team command unchanged to avoid disruption (for now).

Make engine chat syntax translatable The message syntax you see when someone uses chat, e.g. - Player 1: message - [Team]: message - [hedgehog name]: message