One thing that was somehow surprising was seeing the wide one-liner in the
donation page that represents its history. But that's OK since one can use
less to view it instead of gedit.
I thought the site used Semantic MediaWiki. But I guess that keeping the
current approach is also a good thing.
I did some quick search and it's possible to use some Semantic MediaWiki
features to sum the donation amounts (of course it might also have
drawbacks), see this:
https://www.semantic-mediawiki.org/wiki/Help:Sum_format
https://www.semantic-mediawiki.org/wiki/Help:Custom_units
https://www.semantic-mediawiki.org/wiki/Help:Type_Quantity
https://www.semantic-mediawiki.org/wiki/Currency
https://github.com/SemanticMediaWiki/SemanticMediaWiki/issues/1529
https://www.semantic-mediawiki.org/wiki/Help:Type_Number