Additional notifications

[MartinKolarik]

Any time the user gets credits as a sponsor:

Donation received!
Your account has been credited 4000 non-expiring credits. 
Thank you for supporting Globalping!

7 days before a token expires, and then again when it expires:

TODO

[jimaek]

Since we plan to add an auto adoption feature we probably need to notify the user when it's used

"New probe adopted!
Your new probe in Athens (Orange) has been added successfully. It will shortly start generating credits."