Update _ext/translation_graph.py

Author: lwasser

_ext/translation_graph.py

@@ -147,7 +147,7 @@ def run(self):
  paper_bgcolor="rgba(0,0,0,0)",
  plot_bgcolor="rgba(0,0,0,0)",
  hoverlabel_bgcolor="var(--bs-body-bg)",
- hoverlabel_font_color="black",
+ hoverlabel_font_color="rgba(255, 255, 255, 1)",
  font_color="var(--bs-body-color)",
  margin=dict(l=40, r=40, t=40, b=40),
  xaxis_showgrid=False,