Set chargeback and refunded status correctly.

BB-1513 #resolve
Fix typo in monthly donation process script.

BB-1512 #resolve
Don't create €0 donations when creating top three monthly donations.

BB-1511 #resolve
Merge pull request #756 from benkonrath/payment-chargeback-status

Set chargeback and refunded status correctly.
Merge pull request #757 from benkonrath/monthly-donations-process-bug-fixes

Monthly donations process bug fixes
Add flaticons and style admin site
More style tweaks for admin