Version: Bump to v0.7.4b & add changelog (TTT-2#656)

Bumps the version number to v0.7.4b and adds the changelog ingame

Bump gamemode version

Release: Changelog & Versionbump (TTT-2#601)

Update changelog and bumped version number

added changelog and bumped version number (TTT-2#554)

Update CHANGELOG.md

fixed TTT artifacts in polish language

Bump version number | Add changelogs

Remove useless IsValid checks

small finishing touches