[Tails-l10n] What to do with #~ lines in *.po files?

Hi,

in many *.po files there are lines starting with #~ towards the end of
the file. These are regarded as comments and therefore ignored/not shown
in poedit and ikiwiki. As far as I understand, these are created when a
msgid/English original version is deleted upstream and the msgid and
msgstr are not needed any more so they are prefixed with #~.

(This is different from /changing/ the English version and the
translation becoming fuzzy)

Should these lines be deleted or should they be kept because, for
instance, the English version was just moved to another file and the
translations should be moved there too?

On the other hand, it could be desirable to delete the #~ lines because
they are not needed and poedit sometimes reformats them (e.g. line break
after reaching max line length) so they show up in the git-diff but
they don't actually carry any content.

Cheers,
~flapflap