Part 1 of guided tour
Right after the beta feature is enabled, it can point to the "contributions" entry point. to indicate the user how to start a new translation.
Part 2 of guided tour
Once the user gets intro "Contributions" a new guider indicates how to start a translation.
In addition, the first time a red interlanguage link s shown, a guider can introduce it.
Mocks for Part 2