[ui] Confusing tab titles

On the user page, the tab title "Open Source" is misleading: not everything that you can find there is open-source.

Additionally, it is not clear enough from a navigation point-of-view: when you come to the platform, you don't navigate to find an "open-source", you navigate to find a "contribution" (or some other name carrying the same meaning).

The same reasoning goes for "Open Access": this should be a name describing what is inside this section, not why you can access it.

"Resources" is a very good name in that regard: the list of resources provided to you by the platform.