This way translators will find a hint indicating they must use two lines
and not three or more, since the title is optimized for being displayed
in two lines.
The same it's done in the UN official SDG pages.
We could try to split the string on a space which is more or less in the
middle. However, this wouldn't work on languages which don't have spaces
between works, like Chinese.
So in the end I've added a new translation key, where the title is
supposed to be split in several lines the same way it's done by the UN.
Note we're using the code instead of the ID to get the goal in the URL.
IMHO this is what most people would expect; visiting a URL with a "7"
takes you to SDG number 7, and not to the one with "7" as a database ID.
In order to avoid tests (either automated tests or manual tests) passing
by coincidence due to the goal ID and the goal code being the same, I'm
shuffling the codes before entering them in the databse.
I've tried using `resolve` in the routes so the code is automatically
taken into account, but it doesn't work since `resolve` cannot be used
inside a namespace, and here we're within the `sdg` namespace.
