From OTRS - https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=11537109

charts are hard to read in night mode

Steps:

1. In black/dark themes, navigate to the article for Namibia (example)
2. Scroll to the Languages section
3. View the chart in the infobox

Expected:
Text is readable

Actual:
Text is difficult to read

Screens:

Notes - Reproduced on 6.7.2 (1778)