[bn] update bn.toml

[sajibAdhi]

Describe your changes

Bengali Localization update of bn.toml

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Related issue number or link (ex: resolves #issue-number)

Related Issue: #410

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• [x] This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• [x] I have signed off on all commits
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