tutorial: added link to stam-translate extension

tutorial.ipynb

@@ -5270,7 +5270,7 @@
     "Sometimes you're not so much interested in an exact alignment, in the transposition, but you're more interested in a\n",
     "simplified approximate alignment. This can be computed by passing the keyword argument `grow=True` to the `align_texts()` method. The parameter is called `grow` because it effectively computes a transposition first, and then grows that alignment into something larger that is no longer a precise match. Additional keyword arguments like `max_errors` and `minimal_align_length` may be set to adjust the behaviour of the grow algorithm.\n",
     "\n",
-    "This method no longer produces transpositions as result, but *translations* instead. We use a wide definition of term *translation*  here: it is an annotation that maps on text to another but *where the textual content is no longer identical*.\n",
+    "This method no longer produces transpositions as result, but *translations* instead. We use a wide definition of term *translation*  here: it is an annotation that maps on text to another but *where the textual content is no longer identical*. These are documented here: [STAM Translate extension](https://github.com/annotation/stam/tree/master/extensions/stam-translate).\n",
     "\n",
     "The following example illustrates this, compare it to the transposition example earlier:\n"
    ]