Localized theme

Move all translations related to the theme from fun-apps to this
repository.  Previously, these files were included in fun-apps. It makes
more sense to include them directly in the theme and to point to them
via the common settings file of fun-apps.

Also, flag all strings as translatable. Finally, translate
these strings in django.po.

The localization file can now be maintained via the makemessages_fun
command (in fun-apps).
Add "News" to nav menu

Style the various news sections.
Lighter top article news subtitle
Fix news list layout
add div cookie banner in main.html
add cookie banner css file
add ref link css cookie-banner.css in main.html
add js/cookie-banner.js, load it in main file, modifify css
remove div banner from main file, add banner creation and animation in js file
move div banner to main.html to translate it. modify js to show it instead of create it. Add translation banner text in django.po
link read more to privacy page
fix conflicts in cookie-banner.js