Precises exception catch

tracim/tracim/lib/helpers.py

     """
     # TODO - A.P - language code access from test environment
     # try based workaround instead of raw get language call for test
-    # environment only, this should be set with tg.i18n.set_lang in
-    # be I was unable to achieve that.
+    # environment only, this should be set with tg.i18n.set_lang but
+    # I was unable to achieve that.
     try:
         result = tg.i18n.get_lang(all=False)[0]
-    except:
+    except IndexError:
         result = 'en'
     return result