Clarify what is the plan with bn, bn-BD, bn-IN, that are now different versions in Mozilla l10n
There used to be a time when there was no bn in Mozilla. There was only bn-BD.
Now, there is bn, bn-BD, bn-IN.
- We only have bn in Transifex and most translators say 'it is almost the same'.
- We haven't got an alpha now because of #29257 (moved) but it will be called bn-BD
- The translators are quite active and our documentation is already translated, they are translating only one language as bn in Transifex.
This ticket is here to take a decision about that.