Rename section [languages] in *.TOML

[atryastsyn]

I suggest to rename section [languages] to [translations] in *.toml files. The same as vue.js docs I think it's better approach to subject.

For example:

en.toml: [languages] other = "Translations"

ru.toml [languages] other = "Переводы"

etc.

[tdelmas]

That sentence is only used there: https://github.com/letsencrypt/website/blob/800a0f66298776e64ae0ecf0b3cb3e675bd80afc/layouts/partials/header.html#L36 So it only impacts the name of the menu entry "Languages".

Do you have documentation to weigh pros and cons?

[atryastsyn]

@tdelmas , haven't any right now, but I think about better UX.