Added Bangla language support to num2word for Bangladesh. #469

Job	Run time
build (3.7)	33s
build (3.8)	30s
build (3.9)	32s
build (3.10)	39s
build (3.11)	26s
build (3.12)	37s
Indicate completion to coveralls.io	14s
	3m 31s

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