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In the lm_gui app:
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Add support for a Copyright in the generated modules.

In the <Add Message> view, add a <Cancel> button that takes you back
to the main <Manage Set> view.

Add a <Delete Message> button in the left pane.

Make the <Message Description> multi-line.

Make text boxes automatically sized correctly, and resizable.  ROText
should not need scroll bars.

Add error if a lexicon contains a message not in the description.

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In Locale::VersionedMessages
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Quant conditions/strings can be enclosed in brackets or single/double
quotes.  If they do not contain whitespace, they do not need to be
enclosed at all.

Whitespace in quant strings is strictly honored (even in brackets).
