correct typo and translate french

Author: Jean-Matthieu Schertzer

notebooks/demo_clustering.ipynb

@@ -151,7 +151,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In cluster 0, we find players with **good heading and free kick accuracy**, but which are **not the best agile players** (<= 81/100). This rule is a good description of cluster 0: it captures 85% of cluster 1, with a precision of 93% (7% of players described by the rule are not in cluster 0. The third term of the performance term (10) is the number of time that this rule was extracted from the trees built during skope-rules' fitting.\n",
+    "In cluster 0, we find players with **good heading and free kick accuracy**, but which are **not the best agile players** (<= 81/100). This rule is a good description of cluster 0: it captures 85% of cluster 1, with a precision of 93% (7% of players described by the rule are not in cluster 0). The third term of the performance term (10) is the number of time that this rule was extracted from the trees built during skope-rules' fitting.\n",
     "\n",
     "In cluster 1, we find **very agile players** which are **not** the **most aggressive** and **accurate with their heads**. This rule is very precise but misses 23% of this cluster.\n",
     "\n",