Refreshed Bengali Translations and Added New Translations to Bengali (g…

…oogle#1876)

This PR aims to do the following:
1. Refresh the Bengali Translations
2. Add new translations in line with google#653 to complete up to 10%.
3. Corrections to existing translations.

Edit: Recent commits bump up the % completed to 12.

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Co-authored-by: abhik-bits <[email protected]>
Co-authored-by: Mir Wasi Ahmed <[email protected]>