`NumberToWord` is not loadable (likely due to hyphens in folder name)

[fabriceyhc]

It does not appear possible to load the NumberToWord transformation after installing nlaugmenter.

https://github.com/GEM-benchmark/NL-Augmenter/blob/main/nlaugmenter/transformations/number-to-word/transformation.py

This is likely due to number-to-word breaking python's path loading.

[AbinayaM02]

Hi @fabriceyhc: Yes, that might be the possible cause. Would you like to fix #346 and then try?