PicnicTable - Add a multilingual module

[Nordes Ménard-Lamarre]

Because we're after 2000 ;).

For real, a front-end only in one language is quite rare today. Maybe this should be a template decision more than enforced.

I will be using a lazy json file which is loaded at runtime. This mean we could change the implementation to either use a service call or directly a "hard-coded" file.

Vue-i18n is quite a good plugin.

I did it in the past and my final implementation looked a bit like https://kuanhsuh.github.io/2017/09/16/How-to-implement-multi-language-with-Vue-i18n/

So... I should look at the complete article or my previous code and see which one I prefer.