translation-server: logrotate logs of weblate script.

Originally created by @hefee on #16525 (Redmine)

Under /var/lib/weblate/log/ we several logs, that should logrotate. I’d recommend to logrotate daily and use delaycompress, as the scripts may be running while logrotate is executed. logs should be kept for at least 2 weeks. As it will be completly automated better keep it for 4 weeks, so have enough information to look into the past if anything went wrong.

Parent Task: #16436 (closed)