These are SymPy webpages served at:
using github. To modify them, edit the templates in the templates dir and:
./generate
You need to install jinja2 (http://jinja.pocoo.org/) and Babel (http://pypi.python.org/pypi/Babel).
The web pages for each language are generated into the "cs", "de", "en" directories. In order to add a new language, first extract all translatable texts into a .pot file using:
./extract_i18n_text
It will appear in the i18n directory. Then translate it by creating a .po file with the translation in the i18n directory. Compile it using:
./compile_i18n
Then add the language in the generate script, generate the pages and commit the generated files. Don't forget to add the new language in the base.html so that one can switch into it.