In case multiple elements with several dates in one month are inserted,
an additional month layer got added to the roadmap. This changes
ensures, that the month is only displayed once.

- Use default font instead of Hermann
- Reduce size by removing the image and some metainformation

This does not implement multilanguage support for the whole website, but
only for the content of specific pages.

- Restructure the introduced components a little
- Fix links on the mission page
- Remove unused file consulting-iframe