use first tab of xls file for conversion and add xlsx support

requirements.txt

@@ -9,3 +9,4 @@ PyJWT==2.8.0
 httpx[http2]==0.27.0
 pandas==2.2.2
 xlrd==2.0.1
+openpyxl==3.1.5

tournaments/views.py

@@ -346,7 +346,7 @@ def xls_to_csv(request):
             file_name = default_storage.save(file_path, ContentFile(uploaded_file.read()))
 
             # convert to csv and save
-            data_xls = pd.read_excel(file_name, 'Joueurs', index_col=None)
+            data_xls = pd.read_excel(file_name, sheet_name=0, index_col=None)
             csv_file_name = create_random_filename('players', 'csv')
             output_path = os.path.join(directory, csv_file_name)
             data_xls.to_csv(output_path, sep=';', index=False, encoding='utf-8')