[week1] Rename test_prepare_tests -> text_prepare_tests.

Author: aborg-dev

week1/week1-MultilabelClassification.ipynb

@@ -265,7 +265,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Run your implementation for questions from file *test_prepare_tests.tsv* to earn the points."
+    "Run your implementation for questions from file *text_prepare_tests.tsv* to earn the points."
    ]
   },
   {
@@ -277,7 +277,7 @@
    "outputs": [],
    "source": [
     "prepared_questions = []\n",
-    "for line in open('test_prepare_tests.tsv'):\n",
+    "for line in open('text_prepare_tests.tsv'):\n",
     "    line = text_prepare(line.strip())\n",
     "    prepared_questions.append(line)\n",
     "text_prepare_results = '\\n'.join(prepared_questions)\n",