Pratik Dey

Localizes `content/bn/containers-as-a-service.md` to Bengali

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Signed-off-by: [Pratik Dey]([email protected]) Localizes `content/bn/containers-as-a-service.md` to Bengali This is an initial PR as may need some improvements! Tracking issue: https://github.com/cncf/glossary/issues/410

Rename `content/bn/auto_scaling.md` to `content/bn/auto-scaling.md`

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Currently the auto scaling in content/bn/ folder markdown file has an '_' as a separator. Request to add a '-' as a separator