Update roadmap for 2019 & older missing things

This is a big update of the roadmap, as mentioned, and to solve #932 (closed).

I managed to update an important part of the localization as well (as a lot of items are templatable upon older accomplishments) but it may need a quick view and a later update from native speakers @erciccione.

I have been testing it after html and css update, and i am performing a last test actually with all languages included, will update soon about it.