This has already been discussed on the Matrix channel, just opening a ticket to save it somewhere. 1. The donation banner is currently only in English, therefore causes inconsistent interface on the very welcome centre. 2. Either the strings should be extracted via scripty, or manual translations should be used. 3. The current font only supports a very basic character set, it needs better Unicode support. Ideally, it should include not only Latin, but many other scripts as well.
We removed the donation banner, so closing this bug.