Fix #2247: #2205 breaks make html for definition list with classifiers that contains regular-expression like string

tests/roots/test-intl/definition_terms.po

@@ -40,3 +40,8 @@ msgstr "CLASSIFIER1"
 msgid "classifier2"
 msgstr "CLASSIFIER2"
 
+msgid "Some term with"
+msgstr "SOME TERM WITH"
+
+msgid "classifier[]"
+msgstr "CLASSIFIER[]"

tests/roots/test-intl/definition_terms.txt

@@ -12,3 +12,5 @@ Some *term* `with link <http://sphinx-doc.org/>`__
 Some **term** with : classifier1  : classifier2
    The corresponding definition
 
+Some term with : classifier[]
+   The corresponding definition