Expand Docker Webmin module features and translations

[MrZaKaRiA]

What's new (expanded features)

• Container creation/clone wizard with env/ports/volumes, restart policy and healthcheck; one-click exec with inline logs download and host↔container copy helpers.
• Image management: pull/push/tag, build from Dockerfile content, prune dangling images, and update checks.
• Compose runner: choose a compose file path and run up -d, down, ps, or logs.
• Storage: list/inspect/prune volumes and networks; create new volumes and networks.
• Registry credentials: save and login to a registry for private pulls.
• Security: trigger docker scan/trivy if present to scan images.
• Context management: list available Docker contexts and switch within the module.