Label will be expand in filled observation method

Author: AntSimi

src/py_eddy_tracker/observations/observation.py

@@ -1712,6 +1712,8 @@ def filled(
             v = (v - vmin) / (vmax - vmin)
             colors = [cmap(v_) for v_ in v]
             kwargs["facecolors"] = colors
+        if "label" in kwargs:
+            kwargs["label"] = self.format_label(kwargs["label"])
         c = PolyCollection(verts, **kwargs)
         ax.add_collection(c)
         c.cmap = cmap