Explain language param

samples/export.py

@@ -37,7 +37,7 @@ def main():
         "--csv", dest="type", action="store_const", const=("populate_csv", "CSVRequestOptions", "csv", "csv")
     )
     # other options shown in explore_workbooks: workbook.download, workbook.preview_image
-    parser.add_argument("--language")
+    parser.add_argument("--language", help="Text such as 'Average' will appear in this language. Use values like fr, de, es, en")
     parser.add_argument("--workbook", action="store_true")
 
     parser.add_argument("--file", "-f", help="filename to store the exported data")
@@ -79,9 +79,6 @@ def main():
         if args.filter:
             options = options.vf(*args.filter.split(":"))
 
-        if not options.language:
-            options.language = "de"
-
         if args.file:
             filename = args.file
         else: