Share i18n

[alexcjohnson]

• Generalizes the translation scripts @VeraZab made so we can reuse them in batch (didn't work for findTranslationKeys due to the different babel versions... but the other two are shared)
• Localizes a few more things that were missed earlier

[alexcjohnson]

@VeraZab can you give this a quick review, then help me publish it so I can use it in https://github.com/plotly/plotly.js-batch-reporter/pull/24 ?

[VeraZab]

yeah, was looking at it, well, looks good, so you'd like a new patch release?

[alexcjohnson]

so you'd like a new patch release?

yes please 🙏