Obsolete strings

Perhaps I should not throw in such a general question in this hot period,
but this is a question that keeps bugging me for some time and I can see
that the matter is getting more prominent over time.

What is your policy about obsolete strings in PO files? In S2_5 and TRUNK,
after placing nations in separate PO files, this section makes up almost
1/3 of the file. Choking Poedit and bloating the source code may not be the
biggest problem if the obsolete strings are going to be useful in the
future, but I guess we already now that e.g. the obsoleted nation legends
are in a separate file and are now a huge portion of redundant code in the
main PO file that is not going to come back. I also made quite a few
terminological changes over the last years that are not consistent with the
obsolete strings and this may cause some confusion for any future
translators/proofreaders/editors.

I always feel tempted to delete the obsolete strings, but perhaps they are
or may be more useful than I think? Ans is there any "etiquette" for
getting rid of (or not getting rid of) the hard work of previous
translators (whose effort I deeply appreciate, even if I'm not always
comfortable with their translations)?

This is not terribly urgent, so feel free to postpone the answer until
after the release :)

-- 
Hubert

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