On mantis j2se workspace:
src/share/classes/org/apache/crimson/parser/resources/Messages.properties

contains some message fragments as noted on the comment:

# F-NNN ... message fragments (sometimes associated with more
# than one message, but usually just with one)

If multiple messages are being concatinated to produce a new sentence, this will cause grammar errors when running on locales other than English.

The proper way to support localization is to make sure each message is a complete sentence and no 2 messages are being combined to create a new message.