Update charmil_i18n docs

[ankithans]

i18n docs is outdated. One more concern - We may provide i18n wrapper from core, to avoid unnecessary boilerplate in the actual CLI. It will be only 4 lines of code if we include i18n wrapper in core. else it's 120 lines extra.

[namit-chandwani]

We may provide i18n wrapper from core, to avoid unnecessary boilerplate in the actual CLI. It will be only 4 lines of code if we include i18n wrapper in core. else it's 120 lines extra.

I second this.
Apart from the factory-related issues (which will be resolved through #162), I don't see any problem in keeping the i18n package in core itself.