Hi,
In the Barlow font, the German single low quotation mark (‘‚’) is visually too similar to the comma, making it difficult to distinguish the two characters. Additionally, it is positioned too far from the following letter, which results in an awkward typographic appearance. Improving the spacing (that's the bigger issue) and shape would enhance clarity and readability in typesetting German text.
See screenshot with a sample:

Cheers,
Theresa