New language localization (tr) underway - Updates so far

Created by: 7dNp8xK3Ed

So far:

1. New language (Turkish) added into _config.yml file
2. New data folder created. Under lang, new tr folder created and all yml files translated (namely footer-1.yml, footer-2.yml, navigation.yml and roadmap.yml)
3. Under i18n, new folder "tr" created by cloning the template.
4. tr.yml fully translated.
5. "Turkish" as a new language been added into en.yml and es.yml files (so that the language also appears on other language versions of the site)
6. downloads.md, index.md, press-kit.md, techical-specs.md and the-monero-project.md translated.
7. Next: get-started folder.