ERP5TypeTestCase: only update translation table after actually installing bt

When we --load, the sql dump is supposed to be up to date, we don't
need to update translation table every time. This is mainly to solve an
issue that it might not be possible to run ERP5Site_updateTranslationTable
at this point, with testUpgradeInstanceWithOldDataFs this script uses
a print statement, which causes a SyntaxError.

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -1155,6 +1155,7 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
 
         return False
 
+      update_translation_table = False
       for url, bt_title in business_template_list:
         if (update_business_templates and
             erp5_load_data_fs and
@@ -1193,6 +1194,7 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
         bt.install(light_install=light_install,
                    object_to_update=install_kw,
                    check_dependencies=False)
+        update_translation_table = True
         if bt.isCatalogUpdatable() and (
             int(os.environ.get('erp5_tests_recreate_catalog', 0)) or \
             int(os.environ.get('erp5_load_data_fs', 0)) == 0):
@@ -1201,6 +1203,8 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
         self.commit()
         if not quiet:
           ZopeTestCase._print('done (%.3fs)\n' % (time.time() - start))
+      if update_translation_table:
+        self._updateTranslationTable()
 
     def _getSiteCreationParameterDict(self):
       kw = _getConnectionStringDict()
@@ -1295,7 +1299,6 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
                                               light_install=light_install,
                                               quiet=quiet)
             self._recreateCatalog()
-            self._updateTranslationTable()
             self._updateConversionServerConfiguration()
             self._updateMemcachedConfiguration()
             # Create a Manager user at the Portal level