Additional state of info bubble "Contribute now"

[mbohal]

Context:
Currently, there is an info bubble over the Contribution phase when the contribution period is running. It says "Contribute now" (or something like that). A similar bubble pops up atop the voting phase, when voting is on.

Several projects have reported to us that a full voting is too complex for their needs, so they would use the "Support" feature as a kind of informal voting. However, their problem is to make it transparent to users that it's not the voting that they need to reach out for, but that the users need to go to the "Contribution" phase and click the support buttons there.

Concrete task:
The wish is that the info bubble atop the "Contribution phase" does automatically change its label. Priority is that it says the "Contribute now" message, just as it is now. But then, if the contribution phase is over, it should check whether the support phase is currently on, and show a bubble saying "Support now" / "Jetzt unterstützen".